11.82
To find the mean of something, add all the figures and then divide by the number of figures. You would save youself time by just doing this in a calculator instead of posting it here.
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First put them in ascending order. 1, 5, 7, 9, 9, 12, 14, 15, 18 Mean is 10 Median is 9 Mode is 9 Range is 17
9.75
Mean: 13.6 Median: 15 Mode: 16, 18, 15, 9, 10
(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)
10