Question

mean of 8,5,x,6,10,5,7

Answer 1

$Mean = \frac{\Sigma x}{n} \\ => 7 = \frac{8+5+x+6+10+5}{6} \\ => 7 = \frac{34 + x}{6} \\ => 42 = 34 + x \\ => x = 8$