Question

If the mean of five observation x, x+2,x+4,x+6,x+8is11.find the mean of first three observation​

Answer 1

Answer:

$= > 11 = \frac{x + x + 2 + x + 4}{3}$

$= > 11 = \frac{3x + 6}{3}$

$= > 3x + 6 = 11 \times 33$

$= > 3x + 6 = 33$

$= > 3x = 33 - 6$

$= > 3x = 27$

$= > x = \frac{27}{3}$

$= > x = 9$