What is the probability that the individual waits more than 7 minutes today and waits less than 7 minutes tomorrow? Assume that the waiting time on each day is independent.

Statistics 3021
Homework 8
Due: Friday, April 14
Chapter 6.1-6.4
x 6.1 (page 185) (Hint; use the definition of E(X) and V(X)).
x 6.2 (page 185)
x 6.4 (page 185) (a), (b)
Additional question (c) What is the probability that the individual waits more than 7
minutes today and waits less than 7 minutes tomorrow? Assume that the waiting time on each day is independent.
x Problem 1. A certain type of storage battery lasts, on average, 3.0 years with a standard deviation of 0.5 year. Assuming that battery life is normally distributed, find the following probabilities: Use 68-95-99.7 rule. Draw a normal curve to identify the
corresponding areas.
(a) a randomly selected battery will last more than 2 years but less than 2.5 years.
(b) a randomly selected battery will last less than 3.5 years.
x 6.5 (page 186) Additional questions: Draw a normal curve and identify/shade the
corresponding areas for each (a) through (f).
x 6.6 (page 186) Additional questions: Draw a normal curve and identify the given areas.
Locate the ‘z’ for each (a) through (d).
x 6.9 (page 186)
x 6.15 (page 186)
x 6.23

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