39,40,41
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Question
39,40,41
Transcribed Image Text:A normal distribution has a mean of 256 and a standard deviation of 12.5. Find the
probability that a randomly selected value, x, from the distribution is in the given inte
41. P(x ≤240
39. P(x ≥263)
40. P(250≤x≤260)
A normal distribution has a mean of 183 and a standard deviation of 9.4. Find the pro
that a randomly selected value, x, from the distribution is in the given interval.
42. P(185≤x≤190)
43. P(x≤205)
44. P(x ≥ 189
The amount of time high school students spend each weeknight doing homework is
distributed with a mean of 52.5 minutes and a standard deviation of 5.1 minutes. Fi
indicated probability of time spent each weeknight doing homework.
45. A randomly selected high school student spends at least 40 minutes
60 minutes
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