Question

the arithmetic mean of 7,9,11,13,x and 30 is 15 find x.

Answer 1

Answer:

15

Step-by-step explanation:

9-7=2

11-9=2

13-11=2

in every two words difference 2 , so

13+2=15

Answer 2

Answer:

x = 20

Step-by-step explanation:

$arithmetic \: mean = \frac{sum \: of \: the \: observations}{no. \: of \: observations} \\ 15 = \frac{7 + 9 + 11 + 13 + x + 30}{6} \\ 15 = \frac{70 + x}{6} \\ 15 \times 6 = 70 + x \\ 90 = 70 + x \\ x = 90 - 70 = 20 \\ the \: value \: of \: x \: is \: 20$