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Chapter 5: Q. 63 (page 351)
Use the following information to answer the next seven exercises. A distribution is given as . Which is larger, the mean or the median?
Mean is greater than median in this summation.
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Which type of distribution does the graph illustrate?
On average, a pair of running shoes can last 18 months if used every day. The length of time running shoes last is exponentially distributed. What is the probability that a pair of running shoes last more than 15 months? On average, how long would six pairs of running shoes last if they are used one after the other? Eighty percent of running shoes last at most how long if used every day?
The data that follow are the square footage (in 1,000 feet squared) of 28 homes.
The sample mean = 2.50 and the sample standard deviation = 0.8302. The distribution can be written as .
What is ?
Carbon-14 is a radioactive element with a half-life of about
5,730 years. Carbon-14 is said to decay exponentially. The decay rate is 0.000121. We start with one gram of carbon-14.
We are interested in the time (years) it takes to decay carbon-14. Are the data discrete or continuous?
What is the probability that a phone will fail within two years of the date of purchase?
a.
b.
c.
d.
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