Chapter 4: Q.48 (page 286)
Construct the probability distribution function (PDF). Stop at .
Short Answer
The constructed table for the PDF is
Chapter 4: Q.48 (page 286)
Construct the probability distribution function (PDF). Stop at .
The constructed table for the PDF is
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Get started for freeUse the following information to answer the next five exercises: Suppose that a group of statistics students is divided into two groups: business majors and non-business majors. There are business majors in the group and seven non-business majors in the group. A random sample of nine students is taken. We are interested in the number of business majors in the sample.
It has been estimated that only about 30% of California residents have adequate earthquake supplies. Suppose you randomly survey 11 California residents. We are interested in the number who have adequate earthquake supplies.
a. In words, define the random variable X.
b. List the values that X may take on.
c. Give the distribution of X. X ~ _____(_____,_____)
d. What is the probability that at least eight have adequate earthquake supplies?
e. Is it more likely that none or that all of the residents surveyed will have adequate earthquake supplies? Why?
f. How many residents do you expect will have adequate earthquake supplies?
A fair, six-sided die is rolled ten times. Each roll is independent. You want to find the probability of rolling a one more than three times. State the probability question mathematically.
On average, how many years would you expect a physics major to spend doing post-graduate research?
Use the following information to answer the next seven exercises: A ballet instructor is interested in knowing what percent
of each year's class will continue on to the next, so that she can plan what classes to offer. Over the years, she has established
the following probability distribution.
• Let the number of years a student will study ballet with the teacher.
• Let the probability that a student will study ballet x years.
Construct a probability distribution table for the data.
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