Question

If mean of observations
x, x+3, x+6, x+7, x+10 is 9. find
mean of last 3 observations​

Answer 1

Step-by-step explanation:

Mean =(x+x+3+x+5+x+7+x+10)/5

9*5=5x+25

45=5x+25

45-25=5x

20=5x

4=x

Last three number are, 9,11,14

Mean=(9+11+14)/3

Mean =34/3