31.
5 = 1+4
10 = 5+5
16 = 10+6
23 = 16+7
31 = 23+8
Next number will be 31+9 = 40. After that, 40+10 = 50.
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18, 23, 10, 39, 22, 17, 16, 15 Mean = (18 + 23 + 10 + 39 + 22 + 17 + 16 + 15)/8 = 20 Lowest Number in set is 10 Highest Number in set is 39 Range = (39 - 10) = 29
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If you're asking what the nineth erm is, it's 58. The pattern is to add 7 to a umber to get the next number. 2+7=9, 9+7=16, 16+7=23, and so on.
Every next number is increased by 5. The next number in the sequence is 23.
Each number is the sum of the two numbers before it: 4+5=9, 9+5=14, 14+9=23, 23+14=37... The next number is 37+23=60