SOLUTION: six scores have a mean of 8. What must the 7th score be to increase the mean by 1?

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Question 581814: six scores have a mean of 8. What must the 7th score be to increase the mean by 1?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
S/6 = 8

S = 8*6

S = 48
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(S + x)/7 = 8 + 1

(48 + x)/7 = 8 + 1

(48 + x)/7 = 9

48 + x = 9*7

48 + x = 63

x = 63-48

x = 15


So the 7th score must be 15