<< Chapter < Page | Chapter >> Page > |
63. How long must a parent expect to wait for his children to clean their rooms?
64. What is the probability that a parent will wait more than six days given that the parent has already waited more than three days?
Use the following information to answer the next five exercises: Twenty percent of the students at a local community college live in within five miles of the campus. Thirty percent of the students at the same community college receive some kind of financial aid. Of those who live within five miles of the campus, 75% receive some kind of financial aid.
65. Find the probability that a randomly chosen student at the local community college does not live within five miles of the campus.
66. Find the probability that a randomly chosen student at the local community college lives within five miles of the campus or receives some kind of financial aid.
67. Are living in student housing within five miles of the campus and receiving some kind of financial aid mutually exclusive?
68. The interest rate charged on the financial aid is _______ data.
69. The following information is about the students who receive financial aid at the local community college.
Use the following information to answer the next two exercises: P ( A ) = 0.2, P ( B ) = 0.3; A and B are independent events.
70. P ( A AND B ) = ______
71. P ( A OR B ) = _______
72. If H and D are mutually exclusive events, P ( H ) = 0.25, P ( D ) = 0.15, then P ( H | D ).
73. Rebecca and Matt are 14 year old twins. Matt’s height is two standard deviations below the mean for 14 year old boys’ height. Rebecca’s height is 0.10 standard deviations above the mean for 14 year old girls’ height. Interpret this.
74. Construct a histogram of the IPO data (see [link] ).
Use the following information to answer the next three exercises: Ninety homeowners were asked the number of estimates they obtained before having their homes fumigated. Let X = the number of estimates.
x | Relative Frequency | Cumulative Relative Frequency |
---|---|---|
1 | 0.3 | |
2 | 0.2 | |
4 | 0.4 | |
5 | 0.1 |
75. Complete the cumulative frequency column.
76. Calculate the sample mean (a), the sample standard deviation (b) and the percent of the estimates that fall at or below four (c).
77. Calculate the median, M , the first quartile, Q _{1} , the third quartile, Q _{3} . Then construct a box plot of the data.
78. The middle 50% of the data are between _____ and _____.
Use the following information to answer the next three exercises: Seventy 5 ^{th} and 6 ^{th} graders were asked their favorite dinner.
Notification Switch
Would you like to follow the 'Introductory statistics' conversation and receive update notifications?