Question

Mean of 6 numbers is 41. Remove one number and the mean of the five numbers is 46. What is the unknown number

Answer 1

- 16

Explanation:

This is very tricky. Be careful how you do it.

The total of the six numbers is 6*41 = 246

The total of five numbers = 5*46 = 230

What have you you removed to make the number average go up with a smaller sample? The answer is a negative.

230 - 246 = - 16