Question

the mean of 4,5,9,12,14,x,17,and 20 is 12 . find x​

Answer 1

Answer:15

Step-by-step explanation:

(4+9+5+12+14+17+20+x)/8=12

81+x=96

x=15

Answer 2

mean=sum of all observations/no.of observations

mean=4+5+9+12+14+17+20+x/8=12

81+x/8=12

81+x=12×8

81+x=96

x=96-81=15

so, x=15