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UPSC CDS Math Statistics Questions
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© examsnet.com
Question : 30
Total: 63
The mean of 5 numbers is 15. If one more number is included, the mean of the 6 numbers becomes 17. What is the included number ?
[2017 CDS-I]
24
25
26
27
Validate
Solution:
Sum of 5 numbers
=
5
×
15
=
75
Sum of 6 numbers
=
6
×
17
=
102
Therefore, included number= Sum of 6 numbers = Sum of 5 numbers
=
102
−
75
=
27
© examsnet.com
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