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 freeAccording to a Gallup poll, 60% of American adults prefer saving over spending. Let X = the number of American adults out of a random sample of 50 who prefer saving to spending.
a. What is the probability distribution for X?
b. Use your calculator to find the following probabilities:
i. the probability that 25 adults in the sample prefer saving over spending
ii. the probability that at most 20 adults prefer saving
iii. the probability that more than 30 adults prefer saving
c. Using the formulas, calculate the
(i) mean and
(ii) standard deviation of X.
A hospital researcher is interested in the number of times the average post-op patient will ring the nurse during a 12-hour shift. For a random sample of 50 patients, the following information was obtained. What is the expected value?
Find the probability that a physics major will do post-graduate research for at most three years. = _______
About of students participate in a community volunteer program outside of school. If students are selected at random, find the probability that at most of them participate in a community volunteer program outside of school. Use the calculator to find the answer.
The literacy rate for a nation measures the proportion of people age 15 and over who can read and write. The literacy rate for women in Afghanistan is 12%. Let X = the number of Afghani women you ask until one says that she is literate.
a. What is the probability distribution of X?
b. What is the probability that you ask five women before one says she is literate?
c. What is the probability that you must ask ten women?
d. Find the (i) mean and (ii) standard deviation of X.
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