Answered: The National Football League playoffs…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The National Football League playoffs are just about to begin. Because of their great record in
the regular season, the Steelers get a bye in the first week of the playoffs. In the second week, they will play
the winner of the game between the Ravens and the Patriots. A football expert estimates that the Ravens
will beat the Patriots with probability 0.45. This same expert estimates that if the Steelers play the Ravens,
the mean and standard deviation of the point spread (Steelers points minus Ravens points) will be 6.5 and
10.5, whereas if the Steelers play the Patriots, the mean and standard deviation of the point spread (Steelers
points minus Patriots points) will be 3.5 and 12.5. Find the mean and standard deviation of the point spread
(Steelers points minus their opponent’s points) in the Steelers game.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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Given that Steelers get a bye in the 1st week

Steelers play with winner among Ravens and Patriots in the second week.

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