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Four friends are told that the average (mean) of their grades for their favorite class is 83.75%.



Kevin got 94%, Elizabeth got 78%, and Katherine got 83%.

Tyler's grade was not revealed. What's Tylers grade?

Respuesta :

altavistard

Answer:

Tyler got 80%.

Step-by-step explanation:

Represent Tyler's average by t.

Then .94 + .78 + .83 + t

         -------------------------- = 83.75%

                         4

Multiplying both sides by 4, we get  2.55 + t = 3.35

                                                                       

so that t = 3.35 - 2.55 = 0.80

Tyler got 80%.

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