In a continuous frequency distribution, what does the term 'class mark' refer to? MCQ with Answer and Explanation

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In a continuous frequency distribution, what does the term 'class mark' refer to?

A. The difference between upper and lower limits

B. The midpoint of the class interval

C. The sum of frequencies up to that class

D. The frequency of the specific class

Answer: Option B

Solution (By JKSSB Mock Tests)

The class mark is calculated as (Upper Limit + Lower Limit) / 2 and represents the entire class in calculations.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

If P(A)=0.5, P(B)=0.4, P(A∩B)=0.3, then P(A but not B) is:

A. 0.8

B. 0.2

C. 0.5

D. 0.1

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Correct Answer: Option B

Explanation:
P(A∩B') = P(A) - P(A∩B) = 0.5 - 0.3 = 0.2.

This question belongs to: Accountancy and Statistics Statistics

Question #2

The mean of 15 observations is 40. It was found that an observation 23 was wrongly recorded as 32. The correct mean is:

A. 39.4

B. 40.6

C. 41.2

D. 38.5

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Correct Answer: Option A

Explanation:
Correct sum = 15 × 40 - 32 + 23 = 600 - 9 = 591. Correct mean = 591/15 = 39.4.

This question belongs to: Accountancy and Statistics Statistics

Question #3

If the Neonatal Mortality Rate is 25 per 1,000 live births, this means:

A. 25% of infants die before age 1

B. 25 mothers die per 1,000 births

C. Life expectancy is 25 years

D. 25 out of every 1,000 newborns die within the first 28 days

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Correct Answer: Option D

Explanation:
NMR of 25 indicates that for every 1,000 live births, 25 infants die before reaching 28 days of age, highlighting risks in the immediate postnatal period.

This question belongs to: Accountancy and Statistics Statistics

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