4. In the inventory of a multinational office supply retailing corporation, there are 7200 80-sheet smooth paper Renee pads made of acid free and ink-friendly paper in France.

The retailing corporation sells these pads only in packs of 12. Orders received by the retailing corporation are from stationery stores, and the probability mass function of the number of packs of pads per order is

Find the expected value and the standard deviation of the number of pads left in the inventory of the office supply corporation after the next order is shipped.

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X 3 45 10 p(x) 0.4 0.1 0.3 0.2