MEAN FOR UNGROUPED DATA:
_
X = ∑ X
n
__
where X = mean
∑X = sum of the values or measurements
n = number of measurements.
Example:
The measurements are 86, 85, 84, 87, 89. There are 5 measurements
The sum of the measurements divided by the number of measurements:
Mean = 86 + 85 + 84 + 87 + 89
5
__
X = 431
5
__
X = 86.2
