# stats

The mean tax-return preparation fee H&R Block charged retail customers last year was \$183 (The Wall Street Journal, March 7, 2012). Use this price as the population mean and assume the population standard deviation of preparation fees is \$50.

a. What is the probability that the mean price for a sample of 30 H&R Block retail customers is within \$8 of the population mean?

b. What is the probability that the mean price for a sample of 50 H&R Block retail customers is within \$8 of the population mean?

c. What is the probability that the mean price for a sample of 100 H&R Block retail customers is within \$8 of the population mean?

d. Which, if any, of the sample sizes in parts (a), (b), and (c) would you recommend to have at least a .95 probability that the sample mean is within \$8 of the population mean?

1. 👍
2. 👎
3. 👁
4. ℹ️
5. 🚩
1. oruhiuteairs

1. 👍
2. 👎
3. ℹ️
4. 🚩
2. 145

1. 👍
2. 👎
3. ℹ️
4. 🚩
3. 676

1. 👍
2. 👎
3. ℹ️
4. 🚩
4. A. .6212

1. 👍
2. 👎
3. ℹ️
4. 🚩
5. this is correct

1. 👍
2. 👎
3. ℹ️
4. 🚩

## Similar Questions

1. ### Math

VF is a small accounting firm supporting wealthy individuals in their preparation of annual income tax statement. Every December, VF sends out a short survey to their customers, asking for the information required for preparing

2. ### Physics

the weight of the block if wood is 96.5 N. the coefficient of static friction between the block of wood and vertical wall is 0.45. what minimum force is required to prevent the block from sliding down the wall

3. ### pre-algebra

Sarah has been running a dog-walking business since 2010. She walks dogs twice a day, takes them to the park, and returns them to their homes. Each year, she has increased her fee by the same amount. The table shows what Sarah

4. ### physics

A 5.3-kg block is pushed 2.3 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of θ = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction

1. ### Math

The total (after-tax) cost of a laptop computer is \$1278.24. The local sales tax rate is 7.6%. What is the retail (pre-tax) price ?

2. ### Statistics

According to a recent survey, 75% of all customers will return to the same grocery store. Suppose 8 customers are selected at random: A) What is the probability that exactly five of the customers will return? B) What is the

3. ### math

1. Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged \$123.00 for 3 days and 300 miles, while Mary was charged \$216.00 for 5 days and 600 miles. What does Best Rental charge per day, for

4. ### Physics Dynamics

A 10-kg block is pushed against a vertical wall by a horizontal force of 100 N. What is the coefficient of static friction between the block and the wall if the block is about to slide down?

1. ### math

A bank wonders whether omitting the annual credit card fee for customers who charge ar least \$3000 in a year will increase the amount charged on its cards. The bank makes this offer to an SRS of 400 of its customers. It then

2. ### Physics

A block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of  = 30.0° angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.25. (a)

3. ### Bank statistics

A bank wonders whether omitting the annual credit card fee for customers who charge ar least \$3000 in a year will increase the amount charged on its cards. The bank makes this offer to an SRS of 400 of its customers. It then

4. ### math (statistics)

The following table shows the percentage of individuals in each age group who use an online tax program to prepare their federal income tax return. AGE ONLINE TAX PROGRAM (%) 18-34 16 35-44 12 45-54 10 55-64 8 65+ 2 Suppose a