Question

find the mean of 12,25,10,15,18,11 and x is 15 . find the value of x

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Answer 1

Answer:

x = - 80

Step-by-step explanation:

12 + 25 + 10 + 15 + 18 + 11 + x = 15

37 + 25 + 33 + x = 15

62 + 33 + x = 15

95 + x = 15

x = 15 - 95

x = - 80

Hope it helps you....

Answer 2

$mean = \frac{sum \: of \: \:observations}{total \: no. \: of \: observations} \\ \\ 15= \frac{12 + 25 + 10 + 15 + 18 + 11 +x }{7} \\ \\ 15 \times 7 = 91 + x \\ \\ 105 - 91 = x \\ \\ 14 = x$