Question

The mean of 5 observations is 19. Find the fifth observation, if the four observations are
16, 18, 15 and 12.
ha mean
fnrtl
+ 3x + 4 and x + 7 is 25, find the value of x.​

Answer 1

Answer:

let the 5th obs. be x

total no of observation=5

mean =19

19= 16+18+15+12+x/5

19×5=64+x

95-64=x

31=x