Question

Q.9 If the mean of the observations :
X, x + 3, x + 5, x + 7, x + 10 is 9,
the mean of the
of the last three
observations is
31
32
(a)
(b)
3
3
34
35
(c)
(d)
3
3​

Answer 1

Answer:

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