Question

The mean of 5 numbers is 80 out of which mean of 4 numbers is 46. Find the 5th number

Answer 1

let the 5 numbers be v,w,X,y,z
mean =v+w+X+y+z/5=80
given mean of 4numbers 46
46+z/5 =80
46+z=80×5
46+z=400
z = 400-46
z=354
hence 5th number is 354