18. [9 pts, 3 each] A recent study asked working adults if they worked most of their time remotely. The study found that 30% of employees spend most of their time working remotely. Suppose a sample of 150 working adults is drawn. a. What is the mean AND standard deviation of the sample proportion? b. What is the probability that at most 27% of the workers in the sample work remotely most of the time? c. What is the probability that between 32% and 35% of the workers in the sample work remotely most of the time?