Two years ago the mean age of 40people was 11 years .now a person left the group and the mean age changed to 12 years .find the age of the person who left the group .
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Answer:
Age is 52
Step-by-step explanation:
Let's consider
Sum=x
The mean age of 40 people =11 yrs
mean=sum of observations
_________________
no. of observations.
Substitute the values in above formula
11= x
__
40
40x11=x
440=x
The mean age of 49 people= 12 yrs
Sum=y
mean= sum of observations
_________________
no. of observations
12= y
__
39
12x39=y
468=y
Age of the person who left=
520-468= 52
= The age of the person who left is 52.
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