1.

The mean age of 3 students was calculated to be 17 years when a fourth student's age was added, the mean age reduced to 16years.how old is he the fourth srudent.

Answer»

Answer:-

13 years

Explanation :-

Let the total age of THREE students be x

we KNOW that,

mean = total SUM / total no. of obs

ATQ,

mean of 3 students => 17 years

x/3 =17

=> x = 51

•°• total age = 51

ATQ,

fourth student is added to reduce mean age to 16 years

let, the age of 4th student be y

•°• (51+y)/4= 16

=>51+y = 64

=>y= 64-51

=>y= 13

Hence, the age of 4th student is 13 years.


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