Question

A study found that the mean amount of time cars spent indrive-throughs of a certain fast-food restaurant was 147.7 seconds Assuming drive-through times are normally distributed with a standard deviation of 31 seconds :

The probability that a car spends more than 3 minutes in the restaurant's drive-through is ___ ( fill in the answer plz)

Answer #1

Let **X** be a random variable the amount of time
cars spent indrive-throughs of a certain fast-food
restaurant.

It is given that,

Now,

We are to calculate:

The probability that a car spends more than 3 minutes in the
restaurant's drive-through is 0.1487.

I hope this clarifies your doubt. If you're satisfied with the
solution, hit the **Like** button. For further
clarification, comment below. Thank You. :)

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partial credit, 7.2.40
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Click here to view the standard normal distribution table (page
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LOADING...
Click here to view the standard normal distribution table (page
2).
LOADING...
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