4. A greenhouse in a tri-county area has kept track of its customers for the last several years and has determined that 28% of its customers plant a vegetable garden in the spring. The greenhouse obtains a random sample of 1000 of its customers. a. What is the mean and standard deviation of the sampling distribution of p, the sample proportion of customers that plant a vegetable garden in the spring? b. What is the probability that more than 30% of its customers plant a vegetable garden in the spring. Draw and label a curve and then give your answer. c. What is the probability that between 25% and 32 % % of its customers plant a vegetable garden in the spring. Draw and label a curve and then give your answer.