ellen has received the following scores on 3 exams: 82,74and 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?
a.84. b.90. c.94. d.92. e.80
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c it is 94 i think it's right answer
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Given,
scores in 3 xams: 82,74 & 90.
Let score needed by Ellen on next xam be x.
Average scores of 4 xams = 85
•
•.• {82+74+90+x}/4 = 85
or, 82+74+90+x = 85*4 = 340
or, 246+x = 340
=> x = 340-246 =_94_(ans.)
scores in 3 xams: 82,74 & 90.
Let score needed by Ellen on next xam be x.
Average scores of 4 xams = 85
•
•.• {82+74+90+x}/4 = 85
or, 82+74+90+x = 85*4 = 340
or, 246+x = 340
=> x = 340-246 =_94_(ans.)
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