Question

The mean age of 12 boys involved in a survey is 19 years, 3 months. If the age of one of the boys is 22 years, what is the mean age of the other boys.
I need the answer under 5 minute

Answer 1

Mean age of 12 boys = 19 years 3 months

= 19.25 years (3/12= 0.25 years)

Mean=sum of all observations upon total no. of observations

Let sum of all observations be ₩

Therefore,

Mean=₩/12

₩/12=19.25

₩=19.25*12

₩=231

Age of one of the boys=22 years

Therefore,

Mean of the age of other boys(€)

(total 11 boys now)

€=231-22/11

€=209/11

€=19 Years ANSWER