math statistics
posted by aaron need urgent help .
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).

# 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).
? 
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).
?
Respond to this Question
Similar Questions

Algebra
I am in need of some help with the following problem; Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline … 
Algebra
Is this right?2. Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 
alg
2. Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 2006). Use … 
math
examine the rise in gasoline prices from 1997 to 2006. the price of regular unleaded gasoline in january 1997 was $1.26 and in january 2006 the price of regular unleaded gasoline was $2.31 (bureau of labor statistics,2006) use the … 
math statistics
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 … 
statistics
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 … 
MATH 116
Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 2006). Use the … 
Math116/a
2. Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26, and in January 2006, the price of regular unleaded gasoline was $2.31 (“Consumer price index,” 2006). Use … 
Satistics
**I don't want the answer, I want to know how to set the problem up and the formula that I need to use. I am online with a tutor right now, and they can't help me. :( The average price of a gallon of unleaded regular gasoline was … 
statistics
The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in Northern Kentucky use this price as a population mean population standard deviation is $.20. question. what is the probability that the mean price …