McPhilly is conducting a study on the amount of money a customer spends on each visit to the restaurant. The company looks at 20 receipts from each McPhilly. The company found that the mean amount...

Extracted text: McPhilly is conducting a study on the amount of money a customer spends on each visit to the restaurant. The company looks at 20 receipts from each McPhilly. The company found that the mean amount spent is $11 with a $3 standard deviation. a. What type of sampling method was used? b. What is the probability that a customer spend less than $8 each visit? c. What is the probability that a customer spends more than $13 each visit? d. The customers were asked to respond to the following survey question, determine if the question is biased. Explain why or why not? "Do you think you get value for your money at a McPhilly?"