Chapter 5: Q. 73 (page 352)
For each probability and percentile problem, draw the picture.
When age is rounded to the nearest year, do the data stay continuous, or do they become discrete? Why?
The data remains continuous because it cannot be approximated.
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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 ?
Use the following information to answer the next eleven exercises. The age of cars in the staff parking lot of a suburban college is uniformly distributed from six months (0.5 years) to 9.5 years.
The distribution for 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. In words, define the random variable X.
Use the following information to answer the next eleven exercises. The age of cars in the staff parking lot of a suburban college is uniformly distributed from six months (0.5 years) to 9.5 years.
Are the data discrete or continuous?
Suppose that the longevity of a light bulb is exponential with a mean lifetime of eight years. If a bulb has already lasted 12 years, find the probability that it will last a total of over 19 years.
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