SOLUTION: A particular professor never dismisses class early. Let x denote the amount of time past the hour (minutes) that elapses before the professor dismisses class. Suppose that x has a

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Question 715469: A particular professor never dismisses class early. Let x denote the amount of time past the hour (minutes) that elapses before the professor dismisses class. Suppose that x has a uniform distribution on the interval from 0 to 10 min. The density curve is shown in the following figure.
(a) What is the probability that at most 7 min elapse before dismissal?
Correct: 0.7 Your answer is correct.
(b) What is the probability that between 3 and 4 min elapse before dismissal?
Incorrect:
I got the first part right, i just dont understand how to do the second part.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A particular professor never dismisses class early. Let x denote the amount of time past the hour (minutes) that elapses before the professor dismisses class. Suppose that x has a uniform distribution on the interval from 0 to 10 min. The density curve is shown in the following figure.
(a) What is the probability that at most 7 min elapse before dismissal?
base = 7 ; height = 1/10
P(0<= x <=7) = 7*(1/10) = 0.7
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Correct: 0.7 Your answer is correct.
(b) What is the probability that between 3 and 4 min elapse before dismissal?
base = 2 ; height = 1/10
P(3<= x <=4) = 2*1/10 = 0.2
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Cheers,
Stan H.