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Author Question: The time it takes to completely tune an engine of an automobile follows an exponential distribution ... (Read 156 times)

drink

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on: Jun 24, 2018
The time it takes to completely tune an engine of an automobile follows an exponential distribution with a mean of 40 minutes.
 a. Define the random variable in words.
  b. What is the probability of tuning an engine in 30 minutes or less?
  c. What is the probability of tuning an engine between 30 and 35 minutes?

Question 2

A real estate agent wants to estimate the mean selling price of two-bedroom homes in a particular area. She wants to estimate the mean selling price to within 10,000 with an 89.9 level of confidence. The standard deviation of selling prices is unknown but the agent estimates that the highest selling price is 1,000,000 and the lowest is 50,000 . How many homes should be sampled?


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IRincones

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

a. time it takes to completely tune an engine
b. .5276
c. .0555

Answer to Question 2

1518


drink

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Reply 2 on: Jun 24, 2018
Gracias!

diana chang

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Reply 3 on: Yesterday
Excellent

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