(Answered) A certain type of digital camera comes in either a

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A certain type of digital camera comes in either a 3-megapixel version or a 4-megapixel version. A camera store has received a shipment of 18 of these cameras, of which 7 have 3-megapixel resolution. Suppose that 5 of these cameras are randomly selected to be stored behind the counter, the other 13 are placed in a storeroom Let X = the number of 3-megapixel cameras among the 5 selected for behind the counter storage.

(a) Compute P(X = 3).

(b) Compute P(X > 3).

(d) Calculate the standard deviation of X.

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