Question

12. (a) If the arithmetic mean of 7, x – 2, 10, x + 3 is 9, find x.​

Answer 1

Answer:

9

Step-by-step explanation:

The numbers are 7, x-2, 10, x+3

Arithmetic mean = Total sum/Total no.

thus 9 = [7+(x-2)+10+(x+3)] / 4

36= 17+2x+1

36= 18+2x

36-18 =2x

18=2x

x=18/2

therefore x=9.