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Author Question: The time at which the mailman delivers the mail to Ace Bike Shop follows a normal distribution with ... (Read 112 times)

TVarnum

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on: Jun 24, 2018
The time at which the mailman delivers the mail to Ace Bike Shop follows a normal distribution with mean 2:00 P.M. and standard deviation of 15 minutes.
 a. What is the probability the mail will arrive after 2:30 P.M.?
  b. What is the probability the mail will arrive before 1:36 P.M.?
  c. What is the probability the mail will arrive between 1:48 P.M. and 2:09 P.M.?

Question 2

In a random sample of 200 registered voters, 120 indicated they are Democrats. Develop a 95 confidence interval for the proportion of registered voters in the population who are Democrats.


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pocatato

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

a. .0228
b. .0548
c. .5138

Answer to Question 2

.5321 to .6679


TVarnum

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Reply 2 on: Jun 24, 2018
:D TYSM

nguyenhoanhat

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Reply 3 on: Yesterday
Excellent

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