Question

If mean of 8, 6, 7, p and 9 is 7. Find the value of p.

Answer 1

see the image  which is in the box 

Answer 2

observations are 8,6,7,p,9
no of observations are 5
 mean =sum of observations/ no of observations
          ⇒8+6+7+p+9/5=7
           ⇒30+p/5  =7               
           ⇒30+p=7x5
            ⇒30+p=35
            ⇒p=35-30
              ⇒p=5