Explain which would be of more interest in each of the following situations-the probability distribution function or the cumulative probability distribution function for X. If you think both would be of interest, explain why.
a. A pharmaceutical company wants to show that its new drug is effective for lowering blood pressure. The drug is administered to a sample of 800 patients with high blood pressure, and X = the number for whom the drug reduces blood pressure.
b. A caterer who serves dinner at wedding receptions is told in advance the number of people who have said they will attend; X is the number of people who actually attend the dinner.