Answered

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Jim has received scores of
75
and
81
on his first two 100 point tests.
What score must he get on his third 100 point test to keep an average of
84
or greater?

Sagot :

semsee45

Answer:

t ≥ 96   test score must be 96 or greater

Step-by-step explanation:

Let t - score on his third test

   (75 + 81 + t) ÷ 3 ≥ 84

⇒ (75 + 81 + t) ≥ 84 x 3

⇒ (75 + 81 + t) ≥ 252

⇒ 156 + t ≥ 252

⇒ t ≥ 252 - 156 ≥ 96

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