Question

if the mean of five observations is 18 .if one number is excluded,their mean ia 16 .find the excluded number

Answer 1

i got 2 different answer 20 and 26

Answer 2

Given:

→ The mean of 5 numbers is 18 if one number is excluded their men is 16.

Find:

→ Find the excluded number.

Calculations:

→ Mean of five numbers = 18.

→ 5 × 18

→ 90 -----(1)

We know, one number is excluded.

→ 4 × 16

→ 64 -----(2)

Subtracting equation (1) with equation (2), we get:

→ 90 - 64

→ 26

Therefore, 26 is the excluded number.