Guide :Middle School

Four friends are told that the average (mean) of their grades in their favorite class was 89.75%

Four friends are told that the average (mean) of their grades in their favorite class was 89.75% Alex got 88%, Ally got 85%, Jocelyn got 87% , Davids's grade was not revealed. What grade did David g
You  can add use this equation. if you need more hlep ask..8975=.88+.85+.87+x             ------------------                     4 ...

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