The mean of the first 10 even natural numbers is:

Question

Question

This question was previously asked in

Bihar STET TGT (Maths) Official Paper-I (Held On: 04 Sept, 2023 Shift 2)

Answer 1

Concept use:

Mean = Sum of the observation/ Total No of Observation

Sum of First n terms is n(n + 1)/2

Calculations:

First Ten Even numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Mean = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20/ 10

2(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10)/10 = 2 × 10(10 + 1)/(2 × 10) = 11

Hence, The Correct Answer is 11.

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