In a classroom, the average weight of 20 boys is 60 kg and that of 30 girls is 50 kg. The combined average weight of all students is: MCQ with Answer and Explanation

Question

In a classroom, the average weight of 20 boys is 60 kg and that of 30 girls is 50 kg. The combined average weight of all students is:

A. 55 kg

B. 54 kg

C. 52 kg

D. 53 kg

Answer: Option B

Solution (By JKSSB Mock Tests)

Combined mean = (20×60 + 30×50) / 50 = (1200+1500)/50 = 2700/50 = 54 kg.

This question belongs to: Accountancy and Statistics Statistics

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Maternal Mortality Ratio (MMR) is an indicator of:

A. General population mortality

B. Geriatric care quality

C. Risk associated with pregnancy and childbirth

D. Child health care quality

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Correct Answer: Option C

Explanation:
MMR tracks maternal deaths related to pregnancy, childbirth, and the puerperium, highlighting maternal healthcare quality.

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

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D. 0.2

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Correct Answer: Option D

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

This question belongs to: Accountancy and Statistics Statistics

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Which of the following is a measure of morbidity?

A. Life expectancy

B. Incidence rate of a disease

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