3. A marketing research rm collected data for a random sample of 60 customers out of the 8000 who purchased at a supermarket in a particular week. The distribution of amount Spent by a customer is unknown. Data from this survey are available in pset2.xls. Using this data, answer the following questions: a) Using the sample data, draw a histogram of customer purchases. b) What is the average amount spent by customers in the sample? c) What is the sample standard deviation of customer purchases? d) What is the distribution of the average amount spent by customers in the sample? Draw a picture of this distribution. e) Do we know the population average and population standard deviation of amount spent by a customer? If you were to guess these two numbers, what is your best guess