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Author Question: The manager of a grocery store has selected a random sample of 100 customers. The average length of ... (Read 161 times)

Chelseaamend

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on: Jun 24, 2018
The manager of a grocery store has selected a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is 1 minute. The 95 confidence interval for the average checkout time for all customers is _____.
 a. 3 to 5
  b. 1.36 to 4.64
  c. 2.804 to 3.196
  d. 1.04 to 4.96

Question 2

The starting salaries of individuals with an MBA degree are normally distributed with a mean of 40,000 and a standard deviation of 5,000 . What is the probability that a randomly selected individual with an MBA degree will get a starting salary of at least 47,500?
 a. .4332
  b. .9332
  c. .0668
  d. .5000


aruss1303

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

c

Answer to Question 2

c


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