A local hospital provided the following frequency distribution summarizing the
A local hospital provided the following frequency distribution summarizing the weights of babies delivered over the month of January.

Weight (in pounds) .... Number of Babies
2 up to 4 ........ 3
4 up to 6 ........ 8
6 up to 8 ......... 25
8 up to 10 ....... 30
10 up to 12 ........ 4

a. Calculate the mean weight.
b. Calculate the variance and the standard deviation for this sample.

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