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Author Question: The weights of items produced by a company are normally distributed with a mean of 4.5 ounces and a ... (Read 132 times)

cagreen833

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on: Jun 24, 2018
The weights of items produced by a company are normally distributed with a mean of 4.5 ounces and a standard deviation of 0.3 ounce.
 a. What is the probability that a randomly selected item from the production will weigh at least 4.14 ounces?
 b. What percentage of the items weighs between 4.8 and 5.04 ounces?
  c. Determine the minimum weight of the heaviest 5 of all items produced.
  d. If 27,875 items of the entire production weigh at least 5.01 ounces, how many items have been produced?

Question 2

The Highway Safety Department wants to study the driving habits of individuals. A sample of 41 cars traveling on the highway revealed an average speed of 60 miles per hour and a standard deviation of 7 miles per hour. The population of car speeds is approximately normally distributed. Determine a 90 confidence interval estimate for the speed of all cars.


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djpooyouma

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Reply #1 on: Jun 24, 2018
Answer to Question 1

a. .8849
b. 12.28
c. 4.99 ounces
d. 625,000

Answer to Question 2

58.16 to 61.84


cagreen833

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Reply 2 on: Jun 24, 2018
Excellent

yeungji

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Reply 3 on: Yesterday
Wow, this really help

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