A manager tracks parts made by a machine.  She collects data for 30 days. On 7 days 18 parts were made, on 9 days 6 parts were made, and on the remaining days 3 parts were broken. 1.   What is the mean number of parts made?      (round to 2-decimal) 2.   What is the variance of the parts made?   (round to 2-decimal) 3.   What is the standard deviation of the parts made?      (round to 2-decimal) 4.   How many parts will be made in 250days??       (in whole parts)

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