In a frequency distribution with classes 0-9, 10-19, 20-29,... the class boundaries for 20-29 are: MCQ with Answer and Explanation

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In a frequency distribution with classes 0-9, 10-19, 20-29,... the class boundaries for 20-29 are:

A. 19.5 - 28.5

B. 20 - 29

C. 20.5 - 29.5

D. 19.5 - 29.5

Answer: Option D

Solution (By JKSSB Mock Tests)

Given inclusive intervals with gap of 1, subtract 0.5 from lower and add 0.5 to upper.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Maternal Mortality Ratio (MMR) is defined as:

A. Maternal deaths per 1,000 pregnancies

B. Maternal deaths per 10,000 total population

C. Maternal deaths per 1,000 women of reproductive age

D. Maternal deaths per 100,000 live births

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Correct Answer: Option D

Explanation:
MMR = (Number of maternal deaths due to pregnancy-related causes / Number of live births) × 100,000. This ratio focuses on the risk per childbirth event, standardizing for comparison across populations.

This question belongs to: Accountancy and Statistics Statistics

Question #2

A frequency polygon is a graph of:

A. Class boundaries against frequencies

B. Class limits against frequencies

C. Class frequencies against class midpoints

D. Cumulative frequencies

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Correct Answer: Option C

Explanation:
A frequency polygon plots class midpoints on the x‑axis and class frequencies on the y‑axis and joins them by straight lines.

This question belongs to: Accountancy and Statistics Statistics

Question #3

If the arithmetic mean of 25, 30, x, 35, 40 is 33, then x is:

A. 32

B. 30

C. 35

D. 33

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Correct Answer: Option C

Explanation:
Sum = 25+30+x+35+40 = 130+x. Mean = (130+x)/5 = 33 ⇒ 130+x=165 ⇒ x=35.

This question belongs to: Accountancy and Statistics Statistics

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