A lot of 75 washers contains 3 defectives whose variability in thickness is unacceptably large. A sample of 10 washers is selected at random without replacement. a.) Calculate the mean of (x). b.) Calculate the variance of (x). c.) Find the probability that at least one unacceptable washer is in the sample. d.) Calculate the standard deviation of (x). e.) Determine the probability mass function of the number of defective washers (x) in the sample.

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