The arithmetic mean of the first five natural numbers is: MCQ with Answer and Explanation

The arithmetic mean of the first five natural numbers is:
A. 4
B. 3
C. 5
D. 2.5
Answer: Option B
Solution (By JKSSB Mock Tests)
(1+2+3+4+5)/5 = 15/5 = 3.

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Practice More Statistics Questions

Question #1
If the arithmetic mean of 5 numbers is 20, and the arithmetic mean of another 3 numbers is 28, the combined mean of all 8 numbers is:
A. 24
B. 22
C. 25
D. 23

Correct Answer: Option D


Explanation:
Combined mean = (5×20 + 3×28) / (5+3) = (100 + 84) / 8 = 184 / 8 = 23. This formula weights each group's mean by its size.

This question belongs to: Accountancy and Statistics Statistics
Question #2
The cost of living index number for 2022 with base 2015 is 150. This implies that a household which spent Rs. 10,000 per month in 2015 needs to spend ______ in 2022 to maintain the same standard of living.
A. Rs. 11,500
B. Rs. 12,500
C. Rs. 15,000
D. Rs. 10,000

Correct Answer: Option C


Explanation:
Cost of Living Index 150 means the cost has increased by 50%, so new cost = 10,000 × 1.5 = 15,000.

This question belongs to: Accountancy and Statistics Statistics
Question #3
Assertion (A): The arithmetic mean of a set of positive numbers is always greater than or equal to the geometric mean. Reason (R): AM ≥ GM for any set of non-negative numbers, and equality holds when all numbers are equal. Choose the correct option:
A. A is true, R is false
B. A is false, R is true
C. Both A and R are true, but R is not the correct explanation of A
D. Both A and R are true, and R is the correct explanation of A

Correct Answer: Option D


Explanation:
AM-GM inequality is a fundamental property. R correctly states the condition and explains A.

This question belongs to: Accountancy and Statistics Statistics