1 Marks Question

Question 11 Mark

If the probability of winning a game is 0.7, what is the probability of losing it?

Answer

Let E be an event of winning the game, then E' will be losing it.

P(E) + P(E') = 1

⇒ 0.7 + P(E') = 1

⇒ P(E') = 0.3

Hence, the probability of losing the game is 0.3.

View full question & answer→

Question 21 Mark

Very-Short-Answer Questions.
A coin is tossed once. What is the probability of getting a tail?

Answer

When a coin is tossed the outcomes are:

{H, T}

So, the number of outcomes = 2

P(getting a tail)

$=\frac{1}{2}$

View full question & answer→

Question 31 Mark

Fill in the blanks:
The sum of probability of all the outcomes of an experiment is _____.

Answer

The sum of probabilities of all the outcomes of an experiment is one.

View full question & answer→

Question 41 Mark

Very-Short-Answer Questions.
A die is thrown once. Find the probability of getting:
A number greater than 2.

Answer

In a throw of a dice, all possible outcomes are 1, 2, 3, 4, 5, 6

Total number of possible outcomes = 6

Let M be the event of getting a number greater than 2

Then, the favorable outcomes are 3, 4, 5, 6

Number of favorable outcomes = 4

$\therefore$ P(getting a number greater than 2) = P(M)

$=\frac{4}{6}$

$=\frac{2}{3}$

View full question & answer→

Question 51 Mark

Fill in the blanks:
The probability of an impossible event is _____.

Answer

The probability of an impossible event is zero.

View full question & answer→

Question 61 Mark

Fill in the blanks:
The probability of a sure event is _____.

Answer

The probability of a sure event is one.

View full question & answer→

Question 71 Mark

Very-Short-Answer Questions.
Two coins are tossed simultaneously Find the probability of getting:

Exactly 1 head.
at most 1 head.
At least 1 head.

Answer

When two coins are tossed the outcomes are:
{HH, HT, TH, TT}
Total number of outcomes = 4

P(getting exactly 1 head) $=\frac{2}{4}$

$=\frac{1}{2}$

P(getting atmost 1 head) $=\frac{3}{4}$
P(getting atleast 1 head) $=\frac{3}{4}$

View full question & answer→

Question 81 Mark

Fill in the blanks:
The probability of a possibel but not a sure event lies between _____ and _____.

Answer

The probability of a possible but not a sure event lies between zero and one.

View full question & answer→

Question 91 Mark

Very-Short-Answer Questions.
A die is thrown once. Find the probability of getting:
A number other than 3.

Answer

In a throw of a dice, all possible outcomes are 1, 2, 3, 4, 5, 6

Total number of possible outcomes = 6

Let G be event of getting a number other than 3

Then the favorable outcomes are 1, 2, 4, 5, 6

Number of favorable outcomes = 5

$\therefore$ P(getting a number other than 5) = P(G)

$=\frac{5}{6}$

View full question & answer→

Question 101 Mark

Fill in the blanks:
For any event E, P(E) + P(not E) = _____.

Answer

For any event E, P(E) + P(not E) = one.

View full question & answer→

Maths 1 Marks Question

Take a timed test