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3 years ago

Jeannie's scores on her first four tests were 80, 65, 87, and 75. What will

1 answer:

Ivan3 years ago

6 0

She will have to score 93.
(80+65+87+75+x)/5 = 80
307+x = 400
x =400-307=93
Another way, easier to do in your head:
Notice that 65 is 15 below 80, 87 is 7 above 80, and 75 is 5 below 80. The overall situation is 13 below 80 (because -15+7-5=-13). For a number to push the average back to 80, it must be 13 higher than 80. 80+13=93

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Step 2. Then you must apply the Distributive property in the numerator.

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You get:

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sergij07 [2.7K]

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azamat

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