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Probability based on Normal Distribution

The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Suppose the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the following problems.

1. a. What is the probability the sample mean is at least $25.00?

2. b. What is the probability the sample mean is greater than $22.50 but less than $25.00?

3. c. Within what limits will 90 percent of the sample means occur?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M918104

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