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. 15

C. 20

D. 10

Answer: Option D

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

A cumulative frequency distribution shows the number of observations:

A. Less than or more than certain values

B. Exactly equal to a value

C. Only in the first class

D. In the modal class

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Correct Answer: Option A

Explanation:
Cumulative frequencies sum frequencies up to a certain point (less than type) or from a point (more than type).

This question belongs to: Accountancy and Statistics Statistics

Question #2

If a die is rolled, the sample space is:

A. {1,2,3,4,5,6}

B. {1,2,3,4,5}

C. {2,4,6}

D. {0,1,2,3,4,5,6}

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Correct Answer: Option A

Explanation:
A fair die has six possible outcomes: 1,2,3,4,5,6.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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

A. 0.12

B. 0.5

C. 0.1

D. 0.7

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Correct Answer: Option D

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

This question belongs to: Accountancy and Statistics Statistics

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