Posted by **aaron need urgent help** on Monday, October 19, 2009 at 11:20pm.

please help me I've waited for hours

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).

- math statistics -
**Anonymous**, Sunday, November 1, 2009 at 9:43pm
# 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)?

.5878

# 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)?

.7108

# 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)?

.8664

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

?

- math statistics -
**Anonymous**, Thursday, February 11, 2010 at 11:32pm
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)?

.5878

# 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)?

.7108

# 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)?

.8664

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

?

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