# SOLUTION: find the mean of the 15 th through 55 th terms inclusive of the sequence: a billow n = 7 - 4n please i need help to solve any one please help.....

Algebra ->  Algebra  -> Sequences-and-series -> SOLUTION: find the mean of the 15 th through 55 th terms inclusive of the sequence: a billow n = 7 - 4n please i need help to solve any one please help.....      Log On

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Question 195832: find the mean of the 15 th through 55 th terms inclusive of the sequence: a billow n = 7 - 4n please i need help to solve any one please help.....Answer by RAY100(1637)   (Show Source): You can put this solution on YOUR website!a(n) = 7-4n . The form is that of an arithmetic series, a(n) = a(1) +(n-1)d . a(15) = 7-4(15) = -53 . a(55) = 7-4(55) = -213 . Mean is average in arithmetic series . mean = - (213 +53) /2 = -133