to get the average is a simple mathematical formula.

lets say i want to get the average temperature for a week.

monday = 85
tuesday = 75
wednesday = 65
thursday = 70
friday = 83

so i add all the days
85 + 75 + 65 + 70 + 83 = 368

now you divide 368 into the number of days you added, which is 5

368 / 5 = 73.6

so the average temperature of my week is 73.6 degrees

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another way i use to calculate the average value is by having this kind of data

the highest temperature was 85 and the lowest temperature was 65,

but im working on that way . ill post my results later