If the mean of five numbers is 10 and four of them are 8, 9, 11, 12, the fifth number is: MCQ with Answer and Explanation

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If the mean of five numbers is 10 and four of them are 8, 9, 11, 12, the fifth number is:

A. 10

B. 9

C. 8

D. 11

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum = 5×10=50. Sum of four = 8+9+11+12=40. Fifth = 50-40=10.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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An experiment consists of rolling a fair die. Event A = {2, 4, 6} and Event B = {3, 6}. What is P(A ∪ B)?

A. 1/3

B. 5/6

C. 2/3

D. 1/2

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Correct Answer: Option C

Explanation:
A ∪ B = {2, 3, 4, 6}. Four favorable outcomes. P(A ∪ B) = 4/6 = 2/3.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Which of the following is a feature of a good census?

A. All of the above

B. Periodicity

C. Simultaneity

D. Universal coverage within a defined territory

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Correct Answer: Option A

Explanation:
A modern census requires universal coverage, simultaneous enumeration, and regular periodicity (usually 10 years).

This question belongs to: Accountancy and Statistics Statistics

Question #3

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If a coin is tossed 3 times, probability of exactly 2 heads is:

A. 3/8

B. 1/2

C. 1/4

D. 5/8

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Correct Answer: Option A

Explanation:
Favorable: HHT, HTH, THH → 3 out of 8.

This question belongs to: Accountancy and Statistics Statistics

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