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50 questions · timed · auto-graded

MCQ 11 Mark
If $P(A|B) = P(A)$ and $P(B|A) = P(B),$ then what type of events are $A$ and $B ?$
  • Independent events
  • B
    Complementary events
  • C
    Certain events
  • D
    Impossible events
Answer
Correct option: A.
Independent events
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MCQ 21 Mark
If $A ∪ A’ = U,$ then what type of events are $A$ and $A’ ?$
  • A
    Independent variables
  • Complementary events
  • C
    Certain events
  • D
    Impossible events
Answer
Correct option: B.
Complementary events
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MCQ 31 Mark
Which random experiment from the following random experiment has an infinite sample space ?
  • A
    Throwing two dice
  • B
    Selecting two employees from an office.
  • To measure the life of electric bulb
  • D
    Select a card from $52$ cards
Answer
Correct option: C.
To measure the life of electric bulb
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MCQ 41 Mark
Which of the following statement for probability of elementary events $H$ and $T$ of a random experiment of tossing a balanced coin is not true ?
  • A
    $P(T) = 0.5$
  • B
    $P(H) + P(T) = 1$
  • $P(H T) = 0.5$
  • D
    $P(H) = 0.5$
Answer
Correct option: C.
$P(H T) = 0.5$
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MCQ 51 Mark
What is the other name of the classical definition of probability ?
  • Mathematical definition
  • B
    Axiomatic definition
  • C
    Statistical definition
  • D
    Geometric definition
Answer
Correct option: A.
Mathematical definition
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MCQ 61 Mark
Which of the following options is not true for any two events $A$ and $B$ in the sample space $U;$ where, $A ⊂ B ?$
  • $P(A \cap B)=P(B)$
  • B
    $P(A \cap B)=P(A)$
  • C
    $P(A \cup B) \geq P(A)$
  • D
    $P(B-A)=P(B)-P(A)$
Answer
Correct option: A.
$P(A \cap B)=P(B)$
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MCQ 71 Mark
Which of the following options is true for any event of the sample space ?
  • A
    $P ( A )<0$
  • B
    $0 \leq P ( A ) \geq 1$
  • $0 \leq P ( A ) \leq 1$
  • D
    $P ( A )>1$
Answer
Correct option: C.
$0 \leq P ( A ) \leq 1$
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MCQ 81 Mark
What is the value of $P(A ∩ A’)$ for events $A$ and $A’ ?$
  • A
    $1$
  • $0$
  • C
    $0.5$
  • D
    Between $0$ and $1$
Answer
Correct option: B.
$0$
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MCQ 91 Mark
According to the mathematical definition of probability, what is the probability of each outcomes among the n outcomes of a random experiment ?
  • A
    $0$
  • $\frac{1}{n}$
  • C
    $1$
  • D
    Cannot say
Answer
Correct option: B.
$\frac{1}{n}$
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MCQ 101 Mark
For two events $A$ and $B$ of a sample space, state the event $(AB)\  (AB’).$
  • A
    $\phi$
  • B
    $B$
  • $A$
  • D
    $U$
Answer
Correct option: C.
$A$
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MCQ 111 Mark
If $P(A) = 0.4$ and $P(B’) = 0.3$ for two independent events $A$ and $B$ of a sample space, then state the value of $P(A ∩ B).$
  • A
    $0.12$
  • B
    $0.42$
  • $0.28$
  • D
    $0.18$
Answer
Correct option: C.
$0.28$
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MCQ 121 Mark
What is the probability of having $5$ Thursdays in the month of February in a year which is not a leap year $?$
  • $0$
  • B
    $1/7$
  • C
    $2/7$
  • D
    $3/7$
Answer
Correct option: A.
$0$
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MCQ 131 Mark
If events $A$ and $B$ are independ, which of the following options is true $?$
  • $P(A \cap B)= P(A) \times P(B)$
  • B
    $P(A \cap B)= P(A) + P(B)$
  • C
    $P(A \cup B)= P(A) \times P(B)$
  • D
    $P(A \cup B)= P(A) + P(B)$
Answer
Correct option: A.
$P(A \cap B)= P(A) \times P(B)$
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MCQ 141 Mark
If one number is randomly selected between $1$ and $20,$ what is the probability that the number is a multiple of $5 ?$
  • A
    $1/2$
  • $1/6$
  • C
    $1/5 $
  • D
    $1/3$
Answer
Correct option: B.
$1/6$
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MCQ 151 Mark
What is the total number of sample points in the sample space formed by throwing three six-faced balanced dice simultaneously$ ?$
  • A
    $6^2$
  • B
    $3^6$
  • C
    $6 \times 3$
  • $6^3$
Answer
Correct option: D.
$6^3$
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MCQ 161 Mark
Two events $A$ and $B$ of a sample space are mutually exclusive. Which of the following will be equal to $P(B-A) ?$
  • A
    $P(A)$
  • $P(B)$
  • C
    $P(AB)$
  • D
    $P(BA)$
Answer
Correct option: B.
$P(B)$
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MCQ 171 Mark
Which event is given by a special subset $\Phi$ of the sample space $U ?$
  • A
    Certain event
  • B
    Complementary event of 
  • C
    Union event of $U$ and 
  • Impossible event
Answer
Correct option: D.
Impossible event
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MCQ 181 Mark
Event $A\  A’=U,$ hence which type of the events are $A$ and $A’?$
  • Exhaustive
  • B
    Equi-probable
  • C
    Primary
  • D
    Independent
Answer
Correct option: A.
Exhaustive
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MCQ 191 Mark
$A$ and $B$ are mutually exclusive events. Hence, state the value of $P(A B)?$
  • A
    $P - P$
  • B
    $P - P(AB)$
  • $P(AB)$
  • D
    $P + P$
Answer
Correct option: C.
$P(AB)$
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MCQ 201 Mark
 If $P(AB)=0.9$ and $P(A)=0.5$ then what is the value of $P(AB’)? $
  • $0.40$
  • B
    $5/9$
  • C
    $0.45$
  • D
    $0$
Answer
Correct option: A.
$0.40$
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MCQ 211 Mark
If $P(A B)=0.15$ and $P(A’ B)=0.25,$ then what is the value of $P(B)?$
  • A
    $0.1$
  • $0.40$
  • C
    $0.6$
  • D
    $0.15$
Answer
Correct option: B.
$0.40$
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MCQ 221 Mark
What is the probability of having $5$ Monday in the month of January, $2018?$
  • A
    $4/7$
  • B
    $2/7$
  • C
    $1/7$
  • $3/7$
Answer
Correct option: D.
$3/7$
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MCQ 231 Mark
$A$ and $B$ are mutually independent event. If $P(A)=0.6$ and $P(B’)=0.7$ then what is the value of $P(AB)?$
  • $0.18$
  • B
    $0.28$
  • C
    $0.42$
  • D
    $0.12$
Answer
Correct option: A.
$0.18$
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MCQ 241 Mark
$A$ and $B$ are mutually exclusive event. If $P(A) =2/5$ than what is the value of $P(B)?$
  • A
    $1/5$
  • B
    $4/5$
  • $3/5$
  • D
    $5/3$
Answer
Correct option: C.
$3/5$
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MCQ 251 Mark
What is the probability of an event “one who has taken his birth is sure to die”?
  • A
    $0$
  • B
    $1/2$
  • $1$
  • D
    Between $0$ and $1$
Answer
Correct option: C.
$1$
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MCQ 261 Mark
Which of the following options is true when $A$ and $B$ are mutually exclusive events of $0 < P(A) < 1$ and $0 < P(B) < 1?$
  • A
    $P(A \cup B) = P(B)$
  • $P(A \cap B) = P(B)$
  • C
    $P(B \cap A)=P(A) + P(B)$
  • D
    $P(A) + P(B) = 1$
Answer
Correct option: B.
$P(A \cap B) = P(B)$
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MCQ 271 Mark
When result $P(AB)=P(A)+P(B)-P(A) P(B)•P(B)1$ can be possible$?$
  • A
    When $A$ and $B$ are mutually exclusive.
  • When $A$ and $B$ are exhaustive
  • C
    When $A$ and $B$ are mutually independent
  • D
    When $A$ and $B$ are mutually exclusive and exhaustive
Answer
Correct option: B.
When $A$ and $B$ are exhaustive
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MCQ 281 Mark
What is the maximum value of event which is not mutually exclusive event $A$ and $B?$
  • A
    $P(A) = P(A) + P(B) $
  • $P(A) + P(B)$
  • C
    $P (A ∪ B) = P(A) + P(B) – P (A$ and $B)$
  • D
    $P(B) = P(A) + P(B)$
Answer
Correct option: B.
$P(A) + P(B)$
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MCQ 291 Mark
Which of the following options is true for difference event $A-B?$
  • A
    $A - AB$
  • B
    $A – AB’$
  • C
    $A – A’B$
  • $A B’$
Answer
Correct option: D.
$A B’$
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MCQ 301 Mark
If $U=\{1,2,3,4,5,6\}; A=\{1,3,5\}; B=\{2,4,6\},$ hence which type of events are $A$ and $B?$
  • A
    Exhaustive event
  • Mutually exclusive
  • C
    Primary event
  • D
    Equi-probable
Answer
Correct option: B.
Mutually exclusive
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MCQ 311 Mark
Which type of events are primary events?
  • A
    Complementary
  • B
    Mutually exclusive
  • C
    Independent
  • Equi-probable
Answer
Correct option: D.
Equi-probable
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MCQ 321 Mark
If $A$ and $B$ are independent events, the value of $P(A )$
  • A
    $P(A) \neq P(B)$
  • B
    $P(A) = P(B)$
  • $P(A) + P(B)$
  • D
    $P(A) - P(B)$
Answer
Correct option: C.
$P(A) + P(B)$
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MCQ 331 Mark
If the events A and B do not occur simultaneously which type of events are those events?
  • A
    union eve
  • B
    Complementary event
  • C
    Intersection event
  • Mutually exclusive
Answer
Correct option: D.
Mutually exclusive
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MCQ 351 Mark
How will you represent symbolically the event that out of two events $A$ and $B$ at least one of them occurs?
  • A
    $A - B$
  • B
    $AB$
  • $A \cup B$
  • D
    $A’  B’$
Answer
Correct option: C.
$A \cup B$
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MCQ 361 Mark
If the event $A$ and $B$ occur simultaneously, which type of events are those events$?$
  • A
    Union of event
  • Intersection event
  • C
    Exhaustive event
  • D
    Mutually exclusive
Answer
Correct option: B.
Intersection event
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MCQ 371 Mark
The special subset $U$ of the sample space $U$ is which type of event?
  • Certain event
  • B
    Exhaustive event
  • C
    Impossible event
  • D
    Complementary
Answer
Correct option: A.
Certain event
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MCQ 381 Mark
What is the maximum value of $P(A),$ the probability of an event $A?$
  • A
    $0$
  • $1$
  • C
    $-1$
  • D
    Between $-1$ and $1$
Answer
Correct option: B.
$1$
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MCQ 391 Mark
What is the minimum value of $P(A),$ the probability of an event $A?$
  • $0$
  • B
    $1$
  • C
    $-1$
  • D
    Between $-1$ and $1$
Answer
Correct option: A.
$0$
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MCQ 411 Mark
If $U=\{-1,0,2,3,4\}; A=\{1,2,3,4\}$ and $B=\{-1,0,1\}$ then what will be $A\  B’?$
  • A
    $\{1,2,3,4\}$
  • B
    $\{1,2,3\}$
  • C
    $\{-1,0,1\}$
  • $\{2,3,4\}$
Answer
Correct option: D.
$\{2,3,4\}$
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MCQ 431 Mark
 are which type of events for each other?
  • A
    Primary
  • B
    Independent
  • Difference event
  • D
    Exhaustive events
Answer
Correct option: C.
Difference event
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MCQ 441 Mark
 then events $A$ and $B$ of a sample space $U$ are events of which type?
  • A
    Complementary event
  • Independent event
  • C
    Difference event
  • D
    Exhaustive events
Answer
Correct option: B.
Independent event
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MCQ 451 Mark
What is the probability of having 5 Mondays in the month of February in a year which is not a leap year ?
  • $0$
  • B
    $\frac{1}{7}$
  • C
    $\frac{2}{7}$
  • D
    $\frac{3}{7}$
Answer
Correct option: A.
$0$
A
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MCQ 461 Mark
What is the value of $P(A \cap A')$ for events A and $A'$ ?
  • A
    1
  • $0$
  • C
    0.5
  • D
    between 0 and 1
Answer
Correct option: B.
$0$
B
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MCQ 471 Mark
If one number is randomly selected between 1 and 20, what is the probability that the number is a multiple of 5 ?
  • A
    $\frac{1}{2}$
  • B
    $\frac{1}{6}$
  • $\frac{1}{5}$
  • D
    $\frac{1}{3}$
Answer
Correct option: C.
$\frac{1}{5}$
C
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MCQ 481 Mark
According to the mathematical definition of probability, what is the probability of each outcome among the n outcomes of random experiment ?
  • A
    $0$
  • $ \frac{1}{n} $
  • C
    1
  • D
    Can not say
Answer
Correct option: B.
$ \frac{1}{n} $
B
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MCQ 491 Mark
If $ A\cup A' = U $ then what types of events are A and $ A' $ ?
  • A
    Independent events
  • Complementary events
  • C
    Certain events
  • D
    Impossible events
Answer
Correct option: B.
Complementary events
B
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MCQ 501 Mark
Which of the following options is true for any event A of the sample space ?
  • A
    $0 < P(A) < 1$
  • B
    $0 < P(A) \le 1$
  • C
    $0 \le P(A) < 1$
  • $0 \le P(A) \le 1$
Answer
Correct option: D.
$0 \le P(A) \le 1$
D
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MCQ - Statistics STD 12 Commerce Questions - Vidyadip