Question

The mean of 3,5,9,x,11 is are 7 then find 'x'.

Answer 1

Answer:

$\frac{3 + 5 + 9 + x + 11}{5} = 7 \\ 28 + x = 35 \\ x = 35 - 28 \\ x = 7 \: \: \: \: ans.$