Fifty items are submitted for acceptance. If it is known that there are 4 defective items in the lot, determine the probability of finding exactly 1 defective item in a sample of 5. Determine the probability of finding less than 2 defective items in a sample of 5.
From sampled data, state the distribution that is used when calculating
(a) The confidence interval on the mean
(b) The confidence interval on the standard deviation
(c) Comparing two sampled variances
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