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The traffic congestion of a large metro area in Texas reported that the mean one way...

The traffic congestion of a large metro area in Texas reported that the mean one way commute times of employees to the inner city is 75 minutes with the standard deviation of 26 mins samples of size n=40 of these commutes is taken and X is the mean one way commute times for these commuters?

a. P(X < 80 mins)

b. P(X > 70 mins)

c. P(65 < X <73 mins)

math   Statistics-And-Probability   
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