Question

A study found that the mean amount of time cars spent in​drive-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 in​drive-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.

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