Question

4.
2
c) n
d) + 1
If the mean of 10 numbers is 7 and mean of 15 numbers is 12, then the combined mean is
701 180-
a) 7
b) 12 10-22
c) 10
d) 15
(
5.​

Answer 1

Answer:

c) 10

Step-by-step explanation:

in 1st case mean=

sum of 10 no./10=7

sum of 10 no. =7*10=70

in 2nd case mean

sum of 15 no./15=12

sum of 15 no.=12*15=180

combined mean= 70+180/10+15

                          =250/25

                           =10