In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Based on long experience, it can be stated that the normal approximation to the binomial is appropriate when both np and n(1-p) are greater than or equal to 5. If np and n(1-p) are both less than 5, the normal approximation is not appropriate. If either np or n(1-p) is less than 5, the normal approximation may be used with caution. Estimate the requested probabilities using the normal distribution.