Question

find the value of x: if the mean of the following observations 22,12,34,x,9,15 is 18​

Answer 1

Answer:

sum of observation/total no. of observation =mean

$22 + 12 + 34 + x + 9 + 15 \div 6 = 18 \\ 92 + x = 18 \times 6 \\ 92 + x = 108 \\ x = 108 - 92 \\ x = 16$