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?
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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?
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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 :)