Question

8.
The mean of three numbers is 12. Two of the numbers are 9 and 14. What is the third number?
The mean of five numbers is 7. After adding one more number, the mean still remains 7. What is
the new number?​

Answer 1

Answer:

1. 13

2. 0

Step-by-step explanation:

1. Mean of the numbers= 12

Total numbers= 3

1st number=9

2nd number= 14

3rd number=x

Mean= 9+14+x/3

:. 9+14+x/3=12

23+x/3=12

23+x= 12*3

23+x= 36

x=36-23

:. x= 13

2. Mean of 5 numbers= 7

Means after adding one more number= 7

Looking at the given information,

:. Mean before adding the number = Mean after adding the number

The mean remains unchanged,

:. Thus the new number is 0.

Hope it helps :)