Question

The average market scored by Aswin in certain number of is 84. He scored 100 marks in the next test. His new average score of all those tests is 86, then the total number of test he appeared is​

Answer 1

Step-by-step explanation:

Let the sum of all observation = y

No. of observation = x

Then,

Old average = y/x

84 = y/x

y = 84x .......... (i)

Now,

New average = (y+100)/x

86 = (y+100)/x. (Substitute the

value from

equation (i) ).

86 = (84x + 100)/x

86x = 84x+100

86x - 84x = 100

2x = 100

x = 50

Again,

y = 84 × 50

= 4200

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