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. 54 kg

B. 53 kg

C. 52 kg

D. 55 kg

Answer: Option A

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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A sample survey collects data from a sample to:

A. Register births

B. Make inferences about the population

C. Count entire population

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Correct Answer: Option B

Explanation:
Sample surveys aim to estimate population parameters.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In demographic terminology, 'Morbidity' refers to:

A. Migration rates

B. Death rates

C. Birth rates

D. Sickness or disease rates

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Correct Answer: Option D

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Morbidity describes the incidence or prevalence of a disease or illness within a population.

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Question #3

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Two cards are drawn from a deck without replacement. The probability that both are aces is:

A. 4/663

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Correct Answer: Option D

Explanation:
P = (4/52)×(3/51) = 12/2652 = 1/221.

This question belongs to: Accountancy and Statistics Statistics

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