Question

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!!

Answer 1

[73, 100}

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

Answer 2

Correct choice is B

Explanation:

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

`(96+77+74+x)/(4).`

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

`80\le (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%.`