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Anonymous
the mean of 54 and 64 : (54+64)/2 = 59
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1/2(64+22) = 43
13, which is the difference between the highest and lowest numbers, 67 and 54.
54 * 64 * 86 = 247,680
% rate = 84.375% = 54/64 * 100% = 0.84375 * 100% = 84.375%
34