Question

The mean of four numbers is 7, if the sum of first three is 8, find the fourth number

Answer 1

Answer:

8

Step-by-step explanation:

Answer 2

Answer:

mean=sum of numbers/no.of terms

      let the fourth no.be x then,

7   =(8+x)/4

7*4=8+x

28-8=x

x=20