Please tell me if i did this correct

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Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work.

Errors Frequency
51-53 9
54-56 19
57-59 16
60-62 24
63-65 25

This is what I got:

Mean = 59.19
Variance = 1.43
Standard Deviation = 2.05

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