Posted by **aaron** on Monday, October 19, 2009 at 10:12pm.

The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and assume the population standard deviation is $.20.

1. What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?

2. What is the probability that the mean price for a sample of 50 service stations is within $.03 of the population mean (to 4 decimals)?

3. What is the probability that the mean price for a sample of 100 service stations is within $.03 of the population mean (to 4 decimals)?

4. Calculate the sample size necessary to guarantee at least .95 probability that the sample mean is within $.03 of the population mean (0 decimals).

## Answer this Question

## Related Questions

- statistics - please help me I've waited for hours The average price of a gallon ...
- Satistics - **I don't want the answer, I want to know how to set the problem up ...
- math statistics - please help me I've waited for hours The average price of a ...
- statistics - The average price of a gallon of unleaded regular gasoline was ...
- MATH 116 - Examine the rise in gasoline prices from 1997 to 2006. The price of ...
- math - examine the rise in gasoline prices from 1997 to 2006. the price of ...
- alg - 2. Examine the rise in gasoline prices from 1997 to 2006. The price of ...
- Algebra - I am in need of some help with the following problem; Examine the rise...
- Math116/a - 2. Examine the rise in gasoline prices from 1997 to 2006. The price...
- Algebra - Is this right?2. Examine the rise in gasoline prices from 1997 to 2006...

More Related Questions