Chapter 4: Q. 40 (page 286)
Construct the probability distribution function (PDF).
Short Answer
x | P(x) |
0 | 0 |
1 | 0.0009 |
2 | 0.0079 |
3 | 0.0395 |
4 | 0.1227 |
5 | 0.2439 |
6 | 0.3030 |
7 | 0.215 |
8 | 0.0667 |
Chapter 4: Q. 40 (page 286)
Construct the probability distribution function (PDF).
x | P(x) |
0 | 0 |
1 | 0.0009 |
2 | 0.0079 |
3 | 0.0395 |
4 | 0.1227 |
5 | 0.2439 |
6 | 0.3030 |
7 | 0.215 |
8 | 0.0667 |
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Define the random variable X.
X ~ _____(_____,_____)
Jeremiah has basketball practice two days a week. Ninety percent of the time, he attends both practices. Eight percent of the time, he attends one practice. Two percent of the time, he does not attend either practice. What is X and what values does it take on?
According to a recent Pew Research poll, 75% of millenials (people born between 1981 and 1995) have a profile on a social networking site. Let X = the number of millenials you ask until you find a person without a profile on a social networking site.
a. Describe the distribution of X.
b. Find the (i) mean and (ii) standard deviation of X.
c. What is the probability that you must ask ten people to find one person without a social networking site?
d. What is the probability that you must ask 20 people to find one person without a social networking site?
e. What is the probability that you must ask at most five people?
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