Four friends are told that the average (mean) of their grades for their favorite class is 83.75%. Kevin got 94%, El

Question

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?

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Farah 5 years 2021-07-15T14:21:23+00:00 2 Answers 14 views 0

Answers ( )

  1. Philomena
    0
    2021-07-15T14:23:08+00:00
    Reply

    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%.

  2. phucdien
    0
    2021-07-15T14:23:12+00:00
    Reply

    Answer:

    80

    Step-by-step explanation:

    The sum of the 4 grades equals 4 times the average

    94 + 78 + 83 + T = 4 * 83.75

    94 + 78 + 83 + T = 335

    255 + T = 335

    Subtract 255 from both sides

    T = 80

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