Question

4(a) If the mean of 5, 7, x + 1.12, 15, 8 is 9. Find​

Answer 1

Step-by-step explanation:

$mean = 9$

$mean = \frac{sum \: of \: all \: observation}{number \: of \: observation}$

$9 = \frac{5 + 7 + x + 1.12 + 15 + 8}{5}$

$\frac{36.12 + x}{5} = 9$

$36.12 + x = 45$

$x = 45 - 36.12 = 8.8$

Answer 8.8