Question

find arithmetic mean of 7,11,14,18,21,17 and 10,

Answer 1

Given : 7, 11, 14, 18, 21, 17, 10

Arithmetic Mean = $\frac{Sum of all observations}{Number of observations}$

x = $\frac{7+11+14+18+21+17+10}{7}$

x = $\frac{98}{7}$

x = 14

So, the value of x is 14.

Answer 2

Answer:

AN= a+(n-1)d

an= 7+(7-1)4

an=7+24

an= 31