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# the ages (in years) of a random sample of shoppers at a gaming store are shown. determine the range, mean, variance, and standard deviation of the...

the ages (in years) of a random sample of shoppers at a gaming store are shown. determine the range, mean, variance, and standard deviation of the sample data set.12,16,23,14,17,16,19,16,15,18.

I don't understand how to get the variance and standard deviation. I got the range and mean. I have been working on this for over an hour. please just show me what I need to do. Thanks in advance.