# Question: The delivery times for all food orders at a fast food

The delivery times for all food orders at a fast-food restaurant during the lunch hour are normally distributed with a mean of 7.7 minutes and a standard deviation of 2.1 minutes. Let be the mean delivery time for a random sample of 16 orders at this restaurant. Calculate the mean and standard deviation of , and describe the shape of its sampling distribution.

## Answer to relevant Questions

Among college students who hold part-time jobs during the school year, the distribution of the time spent working per week is approximately normally distributed with a mean of 20.20 hours and a standard deviation of 2.60 ...Suppose that the incomes of all people in the United States who own hybrid (gas and electric) automobiles are normally distributed with a mean of $78,000 and a standard deviation of $8300. Let be the mean income of a ...Let x be a continuous random variable that has a normal distribution with µ = 75 and σ = 14. Assuming n/N < .05, find the probability that the sample mean, , for a random sample of 20 taken from this population will be a. ...As mentioned in Exercise 7.22, according to the American Automobile Association’s 2012 annual report Your Driving Costs, the cost of owning and operating a four-wheel drive SUV is $11,350 per year (USA TODAY, April 27, ...Using the formulas of Section 5.3 of Chapter 5 for the mean and standard deviation of a discrete random variable, verify that the mean and standard deviation for the population probability distribution of Table 7.2 are 80.60 ...Post your question