For Gardyloo Manufacturing, the true proportion of accounts receivable with some kind of error is .20. If an auditor randomly samples 225 accounts receivable, what is the approximate normal probability that 39 or fewer will contain errors?
A).1797
B).2097
C).1587
D).0544

Question

Quizplus · Accepted Answer

The correct answer is A because the probability of 39 or fewer accounts receivable containing errors is approximately .1797. This can be calculated using the normal distribution with a mean of 45 (225 * .20) and a standard deviation of 9.43 (sqrt(225 * .20 * .80)).

For Gardyloo Manufacturing, the True Proportion of Accounts Receivable with Some