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The ratio of the marks of 5 students is 2 : 3 : 5 : 1 : 4 and the average of their marks are 45. If another student who has 15 more marks than the highest marks obtained among these 5 student enters into the group. Find the percentage increase in the new average.


1. 15%
2. 16.66%
3. 20%
4. 8%

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Correct Answer - Option 2 : 16.66%

Given:

The ratio of the marks of 5 student are 2 : 3 : 5 : 1 : 4 and

The average of their marks is 45.

Formula used:

Average = Sum of observation/No of observation

Calculation:

Let the marks obtained by 5 five students be 2x, 3x, 5x, x and 4x.

Now, the sum of these marks = x + 3x + 5x + x + 4x = 15x

⇒ 15x/5 = 45

⇒ x = 15

Now, sum of their marks = 15x = 15 × 15 = 225

Maximum marks = 5x = 5 × 15 = 75

So, marks of new student = 75 + 15 = 90

Now, new average is (225 + 90)/6

⇒ 315/6

⇒ 52.5

Increase in average = 52.5 – 45 = 7.5

% Increase = (Increased value/original value) × 100

⇒ (7.5/45) × 100

⇒ 16.66

The %increase in the new average is 16.66.

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