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?
:
Let x = mean of remaining 8 scores
:
{{{(7(78)+8x)/15}}} = 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