Question

If mean of 3 observation x+2, x+4, x+6 is 15 find x.

Answer 1

Answer:

Given data points = x + 2, x+4 , x+6

Mean = $\frac{x+2 +x+4+x+6}{3}$

⇒ 15 = $\frac{x + 2 + x + 4 + x + 6}{3}$

⇒ 15 = $\frac{3x + 12}{3}$

⇒ 15 x 3 = 3x + 12

⇒ 45 = 3x + 12

⇒ 45 - 12 = 3x

⇒ 33 = 3x

⇒ $\frac{33}{3}$ = x

⇒ 11 = x

∴ The value of x is 11.

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