A student has got the following scores in his tests: 87, 95, 76, and 88. He wants average of 85 or better overall. What is the minimum score he must get on the last test in order to achieve that average?

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Solution

The correct option is A
79

The unknown score is "x".
The desired average = 85
So, (87 + 95 + 76 + 88 + x) / 5 = 85
Multiplying through by 5 and simplifying,
87 + 95 + 76 + 88 + x = 425
346 + x = 425
x = 79

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A student has got the following scores in his tests: 87, 95, 76, and 88. He wants average of 85 or better overall. What is the minimum score he must get on the last test in order to achieve that average?

The correct option is A 79 The unknown score is "x". The desired average = 85 So, (87 + 95 + 76 + 88 + x) / 5 = 85 Multiplying through by 5 and simplifying, 87 + 95 + 76 + 88 + x = 425 346 + x = 425 x = 79

The correct option is A
79

The unknown score is "x".
The desired average = 85
So, (87 + 95 + 76 + 88 + x) / 5 = 85
Multiplying through by 5 and simplifying,
87 + 95 + 76 + 88 + x = 425
346 + x = 425
x = 79