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18 questions · timed · auto-graded

MCQ 21 Mark
The mean of 10 observations was found to be 18. Later on it was detected that 12 was misread as 21. The correct means is
  • A
    16.9
  • 17.1
  • C
    17.4
  • D
    18.9
Answer
Correct option: B.
17.1
B
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MCQ 71 Mark
The marks obtained by 10 students in a test are 24, 30, 26, 15, 22, 20, 12, 25, 21 and x and their mean is 21. Then, the value of x is
  • A
    23
  • B
    18
  • C
    17
  • 15
Answer
Correct option: D.
15
D
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MCQ 81 Mark
The mean of 8 numbers is 136.5. The sum of these numbers is
  • A
    1029
  • B
    1209
  • 1092
  • D
    1902
Answer
Correct option: C.
1092
C
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MCQ 121 Mark
In a collection of numbers, 10 appears five times, 11 appears two times, and 12 appears eight times. The median of the data is :
  • A
    5
  • B
    10
  • C
    11
  • 12
Answer
Correct option: D.
12
D
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MCQ 131 Mark
Which of the following is correct?
(i) Mean of the data can be smaller than the smallest number of the data.
(ii) Mean of the data can be bigger than the largest number of the data.
  • A
    Only (i)
  • B
    Only (ii)
  • C
    Both (i) and (ii)
  • Both are wrong
Answer
Correct option: D.
Both are wrong
D
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MCQ 141 Mark
The mean value of the marks obtained by 25 students in a class is 30. If 15 marks are added to every student, then the new mean is:
  • A
    30
  • B
    35
  • 45
  • D
    55
Answer
Correct option: C.
45
C
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MCQ 151 Mark
The following observations are arranged in ascending order. If the median of the data is 15, then the value of x is: 8, 11, 12, x + 6, 17, 18, 23
  • A
    15
  • 9
  • C
    11
  • D
    None of these
Answer
Correct option: B.
9
B
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MCQ 161 Mark
If mean of 25, 29, 25, 32, 24, and x is 27, then what will be the median?
  • A
    32
  • 27
  • C
    26
  • D
    25
Answer
Correct option: B.
27
B
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MCQ 171 Mark
Assertion (A) : Mean of the data is always from the given data.
Reason (R) : Mean $=\frac{\text { sum of observations }}{\text { no. of observations }}$
  • A
    Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  • B
    Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
  • C
    Assertion (A) is true but Reason (R) is false.
  • Assertion (A) is false but Reason (R) is true.
Answer
Correct option: D.
Assertion (A) is false but Reason (R) is true.
D
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MCQ 181 Mark
Assertion (A) : The median of the data 99, 40, 50, 94, 60, 98, 68 is 68.
Reason (R) : When the number of observations is odd, then the mid term (after arranging the data in ascending order) is the median of the data.
  • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  • B
    Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
  • C
    Assertion (A) is true but Reason (R) is false.
  • D
    Assertion (A) is false but Reason (R) is true.
Answer
Correct option: A.
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
A
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MCQ - MATHS STD 6 Questions - Vidyadip