Given a population in which the probability of success is p 0.20, if a sample of

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Given a population in which the probability of success is p 0.20, if a sample of 500 items is taken, then

a. Calculate the probability the proportion of successes in the sample will be between 0.18 and 0.23.

b. Calculate the probability the proportion of successes in the sample will be between 0.18 and 0.23 if the sample size is 200.

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