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abruzzese [7]
3 years ago
11

Find the widest range of scores that you can get on a final exam in order to receive a grade of B for the class. Using interval

notation
Need answer asap!!

Mathematics
2 answers:
Drupady [299]3 years ago
4 0

Answer:

Correct choice is B

Step-by-step explanation:

Let x% be your final test score, then the average of all test scores is

\dfrac{96+77+74+x}{4}.

Since you must have an average between 80% and 89%, then

80\le \dfrac{96+77+74+x}{4}\le 89,\\ \\320\le 247+x\le 356,\\ \\73\le x\le 109.

X is measured in percent, then the greatest value of x can be 100%. You get that

73\%\le x\le 100%.

stellarik [79]3 years ago
3 0

Answer:

[73, 100}

Step-by-step explanation:

96 + 77 + 74 + 65 = 312

312/4 = 78

96 + 77 + 74 + 70= 317

317/4 = 79.25

96 + 77 + 74 + 73 = 320

320/4 = 80

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