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Hi! So I'm working on Business Statistics 1, the problem is: Find the mean and population standard deviation of the distribution with frequency histogram of:

Hi! So I'm working on Business Statistics 1, the problem is:

Find the mean and population standard deviation of the distribution with frequency histogram of: the platoon points are (1,3) (2,2) (3,2) (4,4).

I found the mean, which is 2.64 but I don't know how to find the population standard deviation. Please help!

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