Question

if the mean of x, x + 3, x + 6, x + 9 and x + 12 is 10 then x =​

Answer 1

Answer:

-2 because +12-2 = 10 so x= -2

Step-by-step explanation:

I hope it helps you

Answer 2

Answer:

$mean \: = \frac{sum \: of \: the \: observation}{no \: of \: the \: observation} \\ 10= \frac{x + \: x + 3 \: + x \: + 6 \: + \: x + 9 \: + \: x + 12}{5} \\ 10 = \frac{5x \: + 30}{5} \\ 10 = \frac{5(x + 6)}{5} \\ 10 = x + 6 \\ x = 10 - 6 \\ x = 4$