If the arithmetic mean of 25, 30, x, 35, 40 is 33, then x is: MCQ with Answer and Explanation

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

A. 30

B. 35

C. 32

D. 33

Answer: Option B

Solution (By JKSSB Mock Tests)

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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Question #1

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If a town has 2000 live births, 50 infant deaths, and 20 neonatal deaths, the post-neonatal mortality rate (per 1000 live births) is:

A. 25

B. 10

C. 35

D. 15

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Correct Answer: Option D

Explanation:
Post-neonatal deaths = infant deaths - neonatal = 50-20=30. Rate = (30/2000)×1000 = 15.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Consider the following pairs: (1) CBR - Per 1000 population, (2) GFR - Per 1000 women aged 15-49, (3) IMR - Per 1000 live births. Which pair is correctly matched?

A. 1, 2 and 3

B. 1 and 3 only

C. 2 and 3 only

D. 1 and 2 only

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Correct Answer: Option A

Explanation:
All three definitions are correct.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Which method is most suitable when the field of investigation is vast and informants are educated?

A. Observation method

B. Schedule method

C. Direct interview

D. Mailed questionnaire

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Correct Answer: Option D

Explanation:
Mailed questionnaire can reach a large geographic area at low cost, provided respondents are literate.

This question belongs to: Accountancy and Statistics Statistics

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