Question

The mean age of a family of 6 members is 25 years.The mean age of the family after a 45 year old member leaves is?

Answer 1

Answer:

sum of observation(age of all members)= mean×no. of observations

=25×6=150

Sum after a 45 year old man leaves= 150-45=105

new No. of observations= 6-1=5

New mean= Sum of observations÷No of observations

= 105÷5

=21

Hence new mean after a 45 year old man leaves is 21

Answer 2

Answer:

21 years

Step-by-step explanation:

Mean age of a family of 6 members is 25.

So the total of their ages is 25x6=150

When a family member of age 45 leaves the total becomes 150-45=105 and the number of family members becomes 5

So the new average=total/number

=105/5

=21 years