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Question

Rohit scored 92, 85, and 78 in three Maths tests. How much should he score in the 4th test so as to get an average of 87 in four Maths test?

A
92 marks
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B
91 marks
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C
95 marks
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D
93 marks
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Solution

The correct option is D 93 marks
Let, x be the marks of the fourth test.

we know that,
Average=Sum of observationsTotal number of observations

Average of marks=Sum of Marks in testsNumber of tests
87 = x+92+85+784
87×4 = x + 92 + 85 + 78
348 = x + 92 + 85 +78
348 = x + 255
x = 348 - 255
x = 93

Thus, Rohit should obtain 93 marks to get the average of 87 in four Mathematics tests.

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