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Author Question: The average waiting time at the checkout counter for a large grocery chain is 2.45 minutes with a ... (Read 161 times)

RYAN BANYAN

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on: Jun 24, 2018
The average waiting time at the checkout counter for a large grocery chain is 2.45 minutes with a standard deviation of 24 seconds (0.40 minutes). Assume that the distribution of waiting time is normal. What proportion of the customers are served in between 1 minute and 2.5 minutes?

Question 2

The average SAT score for the 300 students accepted at Tiny College this year is 1050 with a standard deviation of 275 . If a random sample of 40 students is selected from this class, what is the probability that the average SAT score will be between 1060 and 1120?


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frejo

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

0.5517

Answer to Question 2

0.3595


RYAN BANYAN

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Reply 2 on: Jun 24, 2018
Great answer, keep it coming :)

blakcmamba

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Reply 3 on: Yesterday
Excellent

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