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The number of counts in a fixed time interval was recorded 500 times.

With the number of counts going from 0 - 9 respectively

39

106

130

100

67

34

15

7

1

1

I understand how to use the formula in simple probability situations but am a little stuck with this one.

I know the mean = the variance and worked that out to be 67.1 but when using this in the formlua I calculated explodes (shows math error).

Can someone help me please?