Question

To receive Grade ' A' in a course, one must obtain an average of 90 marks or more in five examinations (each of 100 marks). If Sunita's marks in first four examinations are 87 , 92, 94 and 95, find minimum marks that Sunita must obtain in fifth examination to get grade 'A' in the course.

Answer 1

Average of 5 examination scores = 90

Sum of 5 examination scores = 90 x 5 = 450

Find the sum of the 4 examination scores:

Sum of the 4 examination scores = 87 + 92 + 94 + 95 = 368

Find the minimum score she must have for her 5th exam:

5th exam = 450 - 368 = 82

Answer: She must score at least 82 marks in her 5th examination.

Answer 2

Answer:

Average of five examination sco=90

therefore, sum of five examination score =90×5

=450 .

so, the sum of sunithas four examination scores=87+92+94+95=368.

So, the minimum score sunitha must have to get in her 5th examination=450-368 =82.

Therefore, sunitha must score at least 82 Mark in her 5th examination.

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