Mathematics: Sandra s scores on the first 4 tests were 87, 92, 76 and 89. What is the minimum score she needs to make on the fifth test so that her average is at least an 80.

Sandra s scores on the first 4 tests were 87, 92,

Ответ:

Candieboo6939

22.01.2022

Let the score on fifth test be x

Mean test score = (87 + 92 + 76 + 89 + x)/5

Then (87 + 92 + 76 + 89 + x)/5 >= 85

(344 + x)/5 > = 85

Multiply by 5 on each side, we will get

344 + x >= 85*5

344 + x>=425

x>= 425 - 344

x>=81

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Ответ:

Maya629277

15.07.2021

Mathematics

-0.944444442 (seven 4's)

Step-by-step explanation:

34 * 1/3 = 11.3333333

11.3333333/-12 = -0.944444442

(7 3's), (7 4's)

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Sandra's scores on the first 4 tests were 87, 92, 76 and 89. What is the minimum score she needs to make on the fifth test so that her average is at least an 80.

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