In a frequency distribution, if the class midpoints are 10, 20, 30, 40, the class width is: MCQ with Answer and Explanation

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In a frequency distribution, if the class midpoints are 10, 20, 30, 40, the class width is:

A. 5

B. 10

C. 20

D. 15

Answer: Option B

Solution (By JKSSB Mock Tests)

Difference between consecutive midpoints = 10, so class width = 10.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

If P(A)=0.4, P(B)=0.3, and A, B are mutually exclusive, then P(A∪B) is:

A. 0.1

B. 0.12

C. 0.58

D. 0.7

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Correct Answer: Option D

Explanation:
P(A∪B) = P(A)+P(B) = 0.4+0.3=0.7.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If the arithmetic mean of a distribution is 25 and the median is 24, the distribution is likely:

A. Negatively skewed

B. Positively skewed

C. Bimodal

D. Symmetric

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Correct Answer: Option B

Explanation:
Mean > Median indicates positive skewness (right-skewed).

This question belongs to: Accountancy and Statistics Statistics

Question #3

Two dice are rolled. Probability that the sum is 7 or 11 is:

A. 5/36

B. 2/9

C. 7/36

D. 1/6

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Correct Answer: Option B

Explanation:
Ways for sum 7: 6; for sum 11: 2. Total favorable = 8. Probability = 8/36 = 2/9.

This question belongs to: Accountancy and Statistics Statistics

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