(a) Draw the probability density function.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.2: Representing Data
Problem 11PPS
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![4. An analyst has available two forecasts, F₁ and F2, of earnings per share of
a corporation next year. He intends to form a combined forecast as a weighted
average of the two individual forecasts. In forming the combined forecast, weight
X will be given to the first forecast and weight (1 - X) to the second, so that the
combined forecast is XF₁+(1-X)F₂. The analyst wants to choose a value between
0 and 1 for the weight X, but he is quite uncertain of what will be the best choice.
Suppose that what eventually emerges as the best possible choice of the weight X
can be viewed as a random variable uniformly distributed between 0 and 1, having
probability density function fx(x) = 1 for 0 < x < 1, and = 0 for all other values
x of the random variable X.
(a) Draw the probability density function.
1
(b) Find and draw the cumulative distribution function.
(c) Find the probability that the best choice of the weight X is less than .25.
(d) Find the probability that the best choice of the weight X is more than .75.
(e) Find the probability that the best choice of the weight X is between 0.2
and 0.8.
5. An author receives a contract from a publisher, according to which she is to
be paid a fixed sum of $50,000, plus $5.00 for each copy of her book sold. Her
uncertainty about total sales of the book can be represented by a random variable
with mean 30,000 and standard deviation 8,000. Find the mean and the standard
deviation of the total payments she will receive.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd5bca674-cc93-4a76-a5fe-1b7c67580cc0%2F21d21e56-bd90-480f-9398-f05239e84220%2Fbot057m_processed.png&w=3840&q=75)
Transcribed Image Text:4. An analyst has available two forecasts, F₁ and F2, of earnings per share of
a corporation next year. He intends to form a combined forecast as a weighted
average of the two individual forecasts. In forming the combined forecast, weight
X will be given to the first forecast and weight (1 - X) to the second, so that the
combined forecast is XF₁+(1-X)F₂. The analyst wants to choose a value between
0 and 1 for the weight X, but he is quite uncertain of what will be the best choice.
Suppose that what eventually emerges as the best possible choice of the weight X
can be viewed as a random variable uniformly distributed between 0 and 1, having
probability density function fx(x) = 1 for 0 < x < 1, and = 0 for all other values
x of the random variable X.
(a) Draw the probability density function.
1
(b) Find and draw the cumulative distribution function.
(c) Find the probability that the best choice of the weight X is less than .25.
(d) Find the probability that the best choice of the weight X is more than .75.
(e) Find the probability that the best choice of the weight X is between 0.2
and 0.8.
5. An author receives a contract from a publisher, according to which she is to
be paid a fixed sum of $50,000, plus $5.00 for each copy of her book sold. Her
uncertainty about total sales of the book can be represented by a random variable
with mean 30,000 and standard deviation 8,000. Find the mean and the standard
deviation of the total payments she will receive.
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