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Anonymous
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84.75 is the mean of 88, 91, 74 and 86.
88 keys on a piano
If you mean 10 out of 88, then divide 10/88 = 0.1136 --> 11.36 %
61, 85, 88, 101, 120 mean: 91 median: 88 There is no mode. range: 59
88 keys on a piano.