Use the following information to answer the next 16 exercises. 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.

64 .

What is being measured here?

66 .

In words, define the random variable X.

67 .

What is the decay rate (m)?

5.1 Continuous Probability Functions

For each probability and percentile problem, draw the picture.

72 .

Consider the following experiment. You are one of 100 people enlisted to take part in a study to determine the percent of nurses in America with an R.N. (registered nurse) degree. You ask nurses if they have an R.N. degree. The nurses answer "yes" or "no." You then calculate the percentage of nurses with an R.N. degree. You give that percentage to your supervisor.

1. What part of the experiment will yield discrete data?
2. What part of the experiment will yield continuous data?

73 .

When age is rounded to the nearest year, do the data stay continuous, or do they become discrete? Why?