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kicyunya [14]
3 years ago
11

A) [40,100] B- [30,100] C- [16,100] D - [11,100]

Mathematics
2 answers:
Allisa [31]3 years ago
7 0

Hello from MrBillDoesMath!

Answer:

Choice C   [16,100]


Discussion:

Let "x" be the score needed on the 5th exam to achieve an average score >= 60.  Then

(50 + 90 + 66 + 78 + x)/5 >= 60  =>        (multiply both sides by 5)

(50 + 90 +66 + 78) + x >= 60*5 = 300 =>

(284) + x >= 300 =>

x >= 300 - 284 = 16.

As x is a percent, x <= 100, so the interval is [16, 100], which is Choice C.


Thank you,

MrB

liraira [26]3 years ago
7 0
Mthe correct answer is C
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