Question

The mean of four numbers is 40. Three of the four numbers are 35, 41, and 41. What

is the fourth number?

Answer 1

43

Explanation:

Answer 2

43

Explanation:

Use the mean formula:

mean = (sum of elements) / (number of elements)

Let x represent the fourth number, and solve for x:

mean = (sum of elements) / (number of elements)

40 = (35 + 41 + 41 + x) / 4

40 = (117 + x) / 4

160 = 117 + x

43 = x

So, the fourth number is 43