The plus sign, +, is used to add two numbers together. It is one of the four basic arithmetic operations along with:
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The plus symbol: +
The plaus sign where 1 line goes over the other!!
The answer is 68.67.To find the average, you add the numbers together and divide by how many numbers there are. In this case, you would add the numbers together and divide by 3.64 + 69 + 73 = 206206 / 3 = 68.67
If you mean Excel, you can add numbers one at a time with the "+" symbol. To add a larger range of cells, you need to use the sum() function. Don't forget that Excel formulae start with the "=" symbol. Example: = sum(a1:b10) As a convenient shortcut, once you type "sum(", you can select the range with the mouse.
Σ This is the Greek letter Sigma. It is used to start the Autosum facility.