Question

The mean of a set of data is 5. What will be the mean if ten is subtracted from each data ?

-5

5

10

-15

​

Answer 1

Given : mean of a set data is 5

To Find : what will the mean if ten is subtracted from each data?

a) -5

b) -15

c) 10

d) 5​

Solution:

Let say number of data points = n

Mean of Data set  = 5

Total of Data set = 5n

10 is subtracted from Each data

Hence 10n  will be subtracted

New Total = 5n  - 10n  

= - 5n

Number of data = n

New Mean = -5n/n

= - 5

New Mean will be -5

option a is correct

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