Chapter 4: Q. 91 (page 293)
What is the probability that the San Jose Sharks win at least five games in that upcoming month
Short Answer
b.
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Chapter 4: Q. 91 (page 293)
What is the probability that the San Jose Sharks win at least five games in that upcoming month
b.
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We know that for a probability distribution function to be discrete, it must have two characteristics. One is that the sum of the probabilities is one. What is the other characteristic?
Use the following information to answer the next five exercises: Javier volunteers in community events each month. He does not do more than five events in a month. He attends exactly five events of the time, four events of the time, three events of the time, two events of the time, one event of the time, and no events 5% of the time.
In words, the random variable
a. the number of times Mrs. Plum’s cats wake her up each week.
b. the number of times Mrs. Plum’s cats wake her up each hour.
c. the number of times Mrs. Plum’s cats wake her up each night.
d. the number of times Mrs. Plum’s cats wake her up.
A consumer looking to buy a used red Miata car will call dealerships until she finds a dealership that carries the car. She estimates the probability that any independent dealership will have the car will be . We are interested in the number of dealerships she must call.
a. In words, define the random variable .
b. List the values that X may take on.
c. Give the distribution of . ~ _____(_____,_____)
d. On average, how many dealerships would we expect her to have to call until she finds one that has the car?
e. Find the probability that she must call at most four dealerships.
f. Find the probability that she must call three or four dealerships
The literacy rate for a nation measures the proportion of people age 15 and over that can read and write. The literacy rate in Afghanistan is 28.1%. Suppose you choose 15 people in Afghanistan at random. Let X = the number of people who are literate.
a. Sketch a graph of the probability distribution of X.
b. Using the formulas, calculate the (i) mean and (ii) standard deviation of X.
c. Find the probability that more than five people in the sample are literate. Is it is more likely that three people or four people are literate.
According 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.
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