Question

Asked Nov 14, 2019

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Los Angeles workers have an average commute of 31 minutes. Suppose the LA commute time is normally distributed with a standard deviation of 15 minutes. Let X represent the commute time for a randomly selected LA worker.

a. What is the distribution of X? X ~ N(,)

b. Find the probability that a randomly selected LA worker has a commute that is longer than 32 minutes. Round to 4 decimal places.

c. Find the 80th percentile for the commute time of LA workers. Round to 2 decimal places. minutes

Step 1

(a)

The distribution X follows normal with mean µ and standard deviation σ. That is, X~N (µ, σ).

Here, the value of mean is 31 minutes and the standard deviation is 15.

Hence, the distribution X follows normal with mean 31 (µ) and standard deviation 15 (σ). That is, X~N (31,15).

(b)

The probability that a randomly selected LA worker has a commute that is longer than 32 minutes is,

Step 2

Thus, the probability that a randomly selected LA worker has a commute that is longer than 32 minutes is **...**

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