Question

the mean of 15,19,15,X, 15,16,14,21,15 is 16 Find X​

Answer 1

$\huge\boxed{Answer:-}$

x=14

$\huge\boxed{Explanation:-}$

$\small\boxed{Given\:Data:-}$

15,19,15,x,15,16,14,21,15

mean = 16

$\small\boxed{Arithmetic \: mean =}$

Formula

$\frac{sum \: of \: observations}{total \: no. \: of \: observations}$

$16 = \frac{15 + 19 + 15 + x + 15 + 16 + 14 + 21 + 15}{9} \\ 16 = \frac{130 + x}{9} \\ 16 \times 9 = 130 + x \\ 144 - 130 = x$

$\small\boxed{x = 14}$

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