Question

The mean of a, b, c, d and e is 28. If the mean of a, c, and e is 24, What is the mean of band d?

विकल्प

•  31

• 32

• 33

• 34

Answer 1

Given that the mean of a, b, c, d and e is 28. They are 5 in numbers.

Hence, we have

`(a +b+c+d+e)/5 =28`

`⇒((a +c+e)+(b+d))/5=28`

`⇒(a+c+e)/5 +(b+d)/5 = 28`

But, it is given that the mean of a, c and e is 24. Hence, we have

`⇒(a+c+e)/3 =24`

`⇒a+c+e+=72`

Then, we have

`72/5 + (b+d)/5 =28`

`⇒(b+d)/5 =28 -72/5`

`⇒(b+d)/5 = 28-14.4`

`⇒(b+d)/5 = 13.6`

`⇒b+d = 68`

`⇒(b+d)/2 =68/2`

`⇒(b+d)/2 = 34`

Hence, the mean of b and d is 34 .