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A department store has determined that 25% of all their sales are credit sales. A random...

A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected.
a What is the probability that the sample proportion will be greater than 0.34?
b. What is the probability that the sample proportion will be between 0.196 and 0.354?

Math   Statistics-And-Probability   
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