Answers

2016-07-03T22:13:09+08:00
3, _, _, _, _, _, _, _, 23

Let 3 = a1, 23 = a9

23 = 3 + (9-1)d
23 = 3 + (8d)
20= 8d
d = 5/2

The means are 11/2, 8, 21/2, 13, 31/2, 18, 41/2
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