SOLUTION: The mean of 15 scores is 82. If the mean of 7 of those scores is 78, what is the mean of the remaining 8 scores?

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Question 724118: The mean of 15 scores is 82. If the mean of 7 of those scores is 78, what is the mean of the remaining 8 scores?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The mean of 15 scores is 82. If the mean of 7 of those scores is 78, what is the mean of the remaining 8 scores?
:
Let x = mean of remaining 8 scores
:
%287%2878%29%2B8x%29%2F15 = 82
multiply both sides by 15
7(78) + 8x = 15(82)
546 + 8x = 1230
8x = 1230 - 546
8x = 684
x = 684/8
x = 85.5 is the mean of the remaining 8 scores