6 * 60 = 360
You need a total of 360 points.
Add up the points you now have and subtract the sum from 360.
A mean average of 60 on 6 exams is needed to pass a class my scores are
50, 71,76,57, 66 what grade must I make on the last exam to pass the course
2 answers
x1 = 50 = score of first exam
x2 = 71 = score of second exam
x3 = 76 = score of third exam
x4 = 57 = score of fourth exam
x5 = 56 = score of fifth exam
x6 = score of sixth exam
Average of of 6 exams = ( x1 + x2 + x3 + x4 + x5 + x6 ) / 6 =
( 50 + 71 + 76 + 57 + 56 + x6 ) / 6 = ( 310 + x6 ) / 6
You need average 60 so:
( 310 + x6 ) / 6 = 60
Multiply both sides by 6
310 + x6 = 360
Subtract 310 to both sides
x6 = 50
Proof:
( 50 + 71 + 76 + 57 + 56 + 50 ) / 6 = 360 / 6 = 60
x2 = 71 = score of second exam
x3 = 76 = score of third exam
x4 = 57 = score of fourth exam
x5 = 56 = score of fifth exam
x6 = score of sixth exam
Average of of 6 exams = ( x1 + x2 + x3 + x4 + x5 + x6 ) / 6 =
( 50 + 71 + 76 + 57 + 56 + x6 ) / 6 = ( 310 + x6 ) / 6
You need average 60 so:
( 310 + x6 ) / 6 = 60
Multiply both sides by 6
310 + x6 = 360
Subtract 310 to both sides
x6 = 50
Proof:
( 50 + 71 + 76 + 57 + 56 + 50 ) / 6 = 360 / 6 = 60
4 answers