If the mean of a data set is 50 and the coefficient of variation is 20%, the standard deviation is: MCQ with Answer and Explanation

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If the mean of a data set is 50 and the coefficient of variation is 20%, the standard deviation is:

A. 5

B. 10

C. 1000

D. 0.4

Answer: Option B

Solution (By JKSSB Mock Tests)

CV = (SD/mean)×100 ⇒ 20 = (SD/50)×100 ⇒ SD = 10.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Which of the following mortality rates is a better indicator of health infrastructure for newborns?

A. Crude death rate

B. Neonatal mortality rate

C. Maternal mortality ratio

D. Life expectancy at age 60

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Correct Answer: Option B

Explanation:
NMR reflects care during the first 28 days, closely linked to perinatal care and health infrastructure.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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A researcher uses the published census data to study urbanization trends. In this context, the census data is:

A. Qualitative Data

B. Primary Data

C. Secondary Data

D. Experimental Data

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Correct Answer: Option C

Explanation:
Since the data was originally collected by the government and the researcher is reusing it, it acts as secondary data.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Infant Mortality Rate (IMR) is the number of deaths of infants under one year per:

A. 1000 live births

B. 1000 children

C. 1000 population

D. 1000 women

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Correct Answer: Option A

Explanation:
IMR = (Infant deaths < 1 year / Live births) × 1000.

This question belongs to: Accountancy and Statistics Statistics

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