help please! have no idea (normal distribution of weights)

G

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A salt company packages salt in 5-pound bags. The amount of salt per bag varies according to a normal distribution which has a mean of 5 lbs and a standard deviation of 0.05 lbs. A sample of 25 bags is selected from the day's production and the mean of the sample is determined. If it is less than 4.98 pounds, the fill per bag will be increased.

What is the probability that this will happen? Draw a graph of the normail distribution and indicate the area of interest.
 

royhaas

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Dec 14, 2005
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Start by calculating the z-score.
 
G

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do you use 5 to determine z-score or 4.98?
 

tkhunny

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Apr 12, 2005
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Yes. Also, used 0.05 and sqrt(25).

Do you have a book?
 
G

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Guest
yes
 

tkhunny

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So, will you share with us what you get for the z-score of the mean of a sample?
 
G

Guest

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do you get the z-score by looking on that chart in the book? and can you tell me how to get the z-score?
 
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