It's not possible to 'complete' it, as it has potentially an infinite number
of terms.
The next five terms after those shown are: 10, 4, -3, -11, -20 . After those,
there are only an infinite number more.
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25-1=24 24-2=22 22-3=19 19-4=15 15-5=10 The next number in the series is 10.
10
The mean = The sum of all the values ÷ The number of values. 18 + 15 + 22 + 18 + 25 + 19 + 23 = 140 : Number of values = 7 Mean = 140 ÷ 7 = 20
1.4667
22