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Author Question: The transportation manager for the State of New Jersey has determined that the time between arrivals ... (Read 122 times)

biggirl4568

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on: Jun 24, 2018
The transportation manager for the State of New Jersey has determined that the time between arrivals at a toll booth on the state's turnpike is exponentially distributed with  = 4 cars per minute.
 
  Based on this, the average time between arrivals is:A) 15 seconds.
  B) 12 seconds.
  C) 25 seconds.
  D) 4 minutes.

Question 2

It has been reported that, on average, families in Colorado Springs eat fast food 2.2 times per week with a standard deviation of 1.1 times per week.
 
  Assume that the distribution of the number of times that families eat fast food is a normal distribution. What is the likelihood that a family eats fast food more than three times in a single week?
Statistics, Data Analysis, and Decision Modeling ¦ Evans ¦ 5th Edition
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gcook

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

A

Answer to Question 2

 = 2.2,  = 1.1, and x = 3. Using Excel: =1 - NORM.DIST(3,2.2,1.1,TRUE) = 0.2335. There is a likelihood of 23.35 that a family eats fast food more than three times in one week.


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