Question

The mean of five numbers is 8.
Four of the numbers are 5, 9, 3, and 15.
Find the fifth number.

Answer 1

Answer:

mean of 5 numbers is 8

so it's mean value is = 8×5 = 40

sum of four given numbers are

= 5+9+3+15 = 32

so fifth number is = 40 - 32 = 8

Answer 2

Answer:

8

Step-by-step explanation:

mean = $\frac{sum of the given numbers}{number of given numbers}$

given,

mean = 8

lets assume the unknown number to be x

so,

8 =$\frac{5 + 9 + 3 + 15 + x}{5}$

40 = 32 + x

40 - 32 = x

8 = x

hope this helps :)