There is no simple answer. There are simple formulae for simple sequences such as arithmetic or geometric progressions; there are less simple solutions arising from Taylor or Maclaurin series. But for the majority of sequences there are no solutions.
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The sum of the first 20 even numbers... is 110
4 plus 10 plus 16 plus 70 equals 100. To find the sum of this series, simply add all the numbers together.
There is no upper bound to the sum of the numbers in the Fibonacci sequence; both the last number in the series and consequently the sum of all these numbers can be made as large as desired by continuing the series to sufficiently many numbers.
The mean of a series of numbers is the average - calculated by added all the numbers in the series and dividing the sum by the number of numbers in the series. Given the set of numbers {1,2,3,4,5}, the sum of these numbers [1+2+3+4+5=15] divided by 5 {n=5}, gives a mean or average of 3.
That's called the average.