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Informaton · Answer 1 · 2023-06-21T20:51:32+0000

74

Step-by-step explanation:

Total number of tests = 6

The 5 test scores: 80, 85, 73, 78, 90

mean grade = 80

let the 6th test score = y

$\begin{gathered} \operatorname{mean}\text{ =}\frac{s\text{ um of al 6 scores}}{nu\text{mber of scores}} \\ \\ 80\text{ =}(80+85+73+78+90+y)/(6) \\ 80\text{ = }\frac{406\text{ + y}}{6} \end{gathered}$
$\begin{gathered} 80(6)\text{ = 406 + y} \\ 480\text{ = 406 + y} \\ 480\text{ - 406 = y} \\ y\text{ = 74} \end{gathered}$

Shelby needs to score 74 on her 6th test

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