Question

a class of 30 boys, a 7 year old bny joins. Ifthe average remains unchanged. What is the sum of the ages of the class after the boy joined?​

Answer 1

37 boys is answer mark me brains

Answer 2

Answer:

210

Step-by-step explanation:

Average = sum of observations / no. of observations

Let the average be x

First, x = sum/30

30x = sum ____(1)

Next, x = sum+7/31

31x = sum + 7 ___(2)

(2) - (1) => 31x - 30x = (sum+7)-(sum)

=> x = 7

Now, we substitute x = 7 in eqn 2

Because we require the sum of the ages of the class after the boy joined

Sum = 31x - 7 = 31*7 - 7 = 7*(31 - 1)

=> Sum = 7 * 30

=> Sum = 210

Hope it helps

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