posted by Justina .
Records show that 29% of all payments to a mail-order company are submitted after the due date. Suppose 50 payments are submitted this week. Let r be a random variable that represents the number of payments that are late. Use the normal approximation to the binomial to estimate P(r > 20).
Using the information from problem, use the normal approximation to the binomial to estimate P(20< r< 25).