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Get Full Access to Probability And Statistical Inference - 9 Edition - Chapter 5.4 - Problem 15e
Get Full Access to Probability And Statistical Inference - 9 Edition - Chapter 5.4 - Problem 15e

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# Given a fair four-sided die, let Y equal the number of

ISBN: 9780321923271 41

## Solution for problem 15E Chapter 5.4

Probability and Statistical Inference | 9th Edition

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Problem 15E

Problem 15E

Given a fair four-sided die, let Y equal the number of rolls needed to observe each face at least once.

(a) Argue that Y = X1 + X2 + X3 + X4, where Xi has a geometric distribution with pi = (5−i)/4, i = 1, 2, 3, 4, and X1,X2,X3,X4 are independent.

(b) Find the mean and variance of Y.

(c) Find P(Y = y), y = 4, 5, 6, 7.

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Section 3.4 & 3.5 David Holmes STAT 250 Feb 22 Comparing Measures and Distributions  Appropriate Measures  Using Measures to Determine Shape  Using Measures to Compare Distributions Appropriate Measures When dealing with numerical data, one describes the distribution using the characteristics: shape, center, and spread. • What measures for center and spread is best suited for the data Mean or median Standard deviation or IQR • Depends on the shape of the distribution! The shape of the distribution will determine which measures are best for communicating typical values and variability. Example 3.14: S

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