How to mathematically note down "sum of all elements / numbers of elements"

Question

I have 1-n elements and I sum them up (I1+I2+I3...In)/N. Also for 5,5,8 the result is 6. I am not sure about the mathematical notation of the formula.

How about $\frac{\sum\limits_{i=1}^{N}a_i}{N}$? – Nov 04 '14 at 17:27 — , Nov 04 '14 at 17:27

Shane · Accepted Answer · 2014-11-04T17:37:59.853

2

It sounds like you just want notation for the average (the arithmetic mean, to be precise)?

$$\frac{1}{N} \sum_{k=1}^N I_k$$

edited Nov 04 '14 at 17:37

answered Nov 04 '14 at 17:27

Shane

1,325

How to mathematically note down "sum of all elements / numbers of elements"

1 Answers1