10 pts Suppose it is known that the distribution of purchase amounts by customers entering a popular store is approximately normal with a mean of $25 and standard deviation of $8. + a) What is the probability that a randomly selected customer spends less than $36 at this store? (3 marks) b) What is the probability that a randomly selected customer spends between $16 and $36 (3 marks) c) if the shaded area in the graph below covers 80% of all custom selected purchase, what does the X value have to be? (4 marks) 80% Edit View Insen Format Tools Table 12pt Paragraph A)-25 BIUA 25