Ellen has received the following scores on 3 exams: 82, 74, and 90. What score will Ellen need to receive on the next exam so that the average (arithmetic mean) score for the 4 exams will be 85?
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if avg for 4 exams is 85
therefore total score for 4 exams is 340
(avg = total/no. of exams)
current total = 246
340 - 246 = 94
therefore she must score 94 on her next exam for an average of 85
therefore total score for 4 exams is 340
(avg = total/no. of exams)
current total = 246
340 - 246 = 94
therefore she must score 94 on her next exam for an average of 85
pawpw:
thank you
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