It could be tn = n2 + 6 for n = 1,2,3,...
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It is not a rule as such; those number are the first 10 prime numbers.
10 + 10 + 10 + 10 + 15 + 15 + 0 = 7070/7 = 10Average = 10
The rule for the pattern is y=x+2. That rule is in the table format in which it would originally be in, but the worded rule would be 'It increases by 2 each time'.
It is: -2 because -2-15 = -10-7 => -17 = -17
15/10 + 7/100 = 1.57