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Chapter 5: Q.5.6 (page 346)
For a continuous probability distribution, . What is ?
The probability will be.
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The amount of time a service technician needs to change the oil in a car is uniformly distributed between 11 and 21 minutes. Let X = the time needed to change the oil on a car.
a. Write the random variable X in words. X = __________________.
b. Write the distribution.
c. Graph the distribution.
d. Find P (x > 19).
e. Find the 50th percentile.
The number of days ahead travelers purchase their airline tickets can be modeled by an exponential distribution with the average amount of time equal to 15 days. Find the probability that a traveler will purchase a ticket fewer than ten days in advance. How many days do half of all travelers wait?
What is the median lifetime of these phones (in years)?
a.
b.
c.
d.
Find the probability that falls in the shaded area.
Suppose the time it takes a student to finish a quiz is uniformly distributed between six and 15 minutes, inclusive. Let the time, in minutes, it takes a student to finish a quiz. Then Find the probability that a randomly selected student needs at least eight minutes to complete the quiz. Then find the probability that a different student needs at least eight minutes to finish the quiz given that she has already taken more than seven minutes.
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