Posted by Courtney on Friday, November 16, 2007 at 11:10pm.
How would I go about solving these problems?
In Exercise 9 we suggested the model N(1152,84) for weights in pounds of yearling Angus steers. What weight would you consider to be unusually low for such an animal? Explain.
If you are given the model N(1152,84),what are the cutoff values for the middle 40% of the weights?

AP Statistics  PsyDAG, Saturday, November 17, 2007 at 10:04am
I assume that you are talking about a normal distribution with a mean of 1152 and standard deviation of 84.
A Z score is the score in terms of standard deviations (SD), with 2 SD usually being considered low.
Z = (x  ƒÊ)/SD, where x = weight value and ƒÊ = mean. Solve for the unknown, once you find the Z score
The middle 40% is ƒÊ } 20%.
Look up the various Z score values in the table in the back of your statistics booklabeled something like "areas under the normal distribution."
I hope this helps. Thanks for asking.
Answer This Question
Related Questions
 Statistics  It is not surprising that babies with low birth weights are at risk...
 STAT  The weights of the 100 students in an introductory statistics class are ...
 STAT  The weights of the 100 students in an introductory statistics class are ...
 STAT  The weights of the 100 students in an introductory statistics class are ...
 algebra  A certain kind of animal weighs about 77 pounds at birth and gains 2 ...
 Math  The sum of the weights of a dog and cat is 27 pounds. The dog weights an ...
 statistics  A shipping company received an order of 1645 packages. The manager ...
 Statistics  The average weight of a group of people is 156 pounds and the SD is...
 math  A certain kind of animal weighs about 73 pounds at birth and gains about ...
 Algebra  A certain kind of animal weighs about 71 pounds at birth and gains ...
More Related Questions