Question

If the mean of 9, 8, 10, x, 12 is 15, find the value of x

Answer 1

$mean = \frac{sum \: of \: no \: of \: total \: \: no \: of \: obsevations }{n \: of \: observations} \\ 15 = \frac{9 + 8 + 10 + 12 + x}{5} \\ 15 = \frac{39 + x}{5} \\ 15 \times 5 = 39 + x \\ 75 - 39 = x \\36 = x \\ \\ hope \: it \: helps \: you \:$

Answer 2

The value of x is 36

Step-by-step explanation:

$Mean =\frac{\text{Sum of all observations}}{\text{No. of observations}}$

We are given that the mean of 9, 8, 10, x, 12 is 15.

$Mean = \frac{9+8+10+x+12}{5}\\15 =\frac{9+8+10+x+12}{5}\\15 \times 5 =9+8+10+x+12\\75=39+x\\75-39=x\\36=x$

Hence The value of x is 36

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