continuous probability distributions

dj20818

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Apr 26, 2011
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1.Question: The number of viewers of American Idol has a mean of 29 million with a standard deviation of 5 million. What is the probability thaty next week show will:
a. have between 30 and 34 million viewers?
b. have at least 23 million viewers?
c. Exceedd 40 million viewers?



2. Question: typical American listnened to 195 hours of music in the last year. this is down from 290 hours four years earlier. Assume the number of housrs spent listening to music followsa normal probability distribution with a standard deviation of 8.5 hrs.
a. if **** is in the top 1 percent in terms of listening time, how many hours does he listen per year?
b. assume that the distribution of times four years earlier aslo folows the normal probability with a standard deviation of 8.5 hours. How many hours did the 1 percent who listen to the least music actually listen?
 
dj20818 said:
1.Question: The number of viewers of American Idol has a mean of 29 million with a standard deviation of 5 million. What is the probability thaty next week show will:
a. have between 30 and 34 million viewers?
b. have at least 23 million viewers?
c. Exceedd 40 million viewers?



2. Question: typical American listnened to 195 hours of music in the last year. this is down from 290 hours four years earlier. Assume the number of housrs spent listening to music followsa normal probability distribution with a standard deviation of 8.5 hrs.
a. if **** is in the top 1 percent in terms of listening time, how many hours does he listen per year?
b. assume that the distribution of times four years earlier aslo folows the normal probability with a standard deviation of 8.5 hours. How many hours did the 1 percent who listen to the least music actually listen?

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