3. Based on data collected by the National Center for Statistics, an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 24 percent. If we select a random sample of 20 adults, find the probability that the number of people in the sample who have been told that they have hypertension will be: a. Exactly three b. Three or more C. Fewer than three d. Between three and seven, inclusive 4. In a market study, a researcher found that 70% of customers are repeat customers. If 10 customers are selected at random. a. Find the probability that at least one customer is repeat customer. b. Find the probability that exactly 7 are repeat customers. C. How many would you expect to be repeat customers? d. Find the variance and standard deviation of the number of repeat customers