Question

The mean of 10 number is 28.if one number is excluded, their mean is 25. Find the excluded number.

Answer 1

Answer:

55

Explanation:

Mean of 10 numbers is 28.

Sum of 10 numbers = 28 × 10 = 280

Mean of 9 numbers = 25

sum of 9 numbers = 25 × 9 = 225

Therefore, excluded number = 280 - 225 = 55