Question

If the mean of the data 9,x,5,x,12,10,18,47,18,21 is known to be 10,what isthe value of x

Answer 1

mean of data =

(9+x+5+x+12+10+18+47+18+21)/10

10=(140+2x)/10

140+2x=100

2x=-40

x=-20

hope its help u...