A two-horse race is about to take place. Horse A's finishing time X is uniformly distributed between 3 and 8 minutes. Horse B's finishing time Y has a uniform distribution conditional on X, as follows: 4 x fx₁x (y|x) = for ≤ y ≤2x 7x 4 a. Find the pdf of Y (HINT: define first fxy and the joint sample of X and Y). b. Find fxy(xy), the conditional pdf for X given Y. C. Are the event S=X ≤ Y and the random variable Y independent, i.e. is P(S|Y=y) = P(S)? d. What is the probability that the winner wins by less than 1 minute? e. Find the probability that the winning time is less than 6 minutes.

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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1. A two-horse race is about to take place. Horse A's finishing time X is uniformly distributed between 3 and 8
minutes. Horse B's finishing time Y has a uniform distribution conditional on X, as follows:
x
fx₁x (y | x) = for = ≤ y ≤2x
4
7x
4
a. Find the pdf of Y (HINT: define first fxy and the joint sample of X and Y).
b. Find fxy(xly), the conditional pdf for X given Y.
c. Are the event S=X ≤ Y and the random variable Y independent, i.e. is P(S|Y=y) = P(S)?
What is the probability that the winner wins by less than 1 minute?
Find the probability that the winning time is less than 6 minutes.
d.
e.
Transcribed Image Text:1. A two-horse race is about to take place. Horse A's finishing time X is uniformly distributed between 3 and 8 minutes. Horse B's finishing time Y has a uniform distribution conditional on X, as follows: x fx₁x (y | x) = for = ≤ y ≤2x 4 7x 4 a. Find the pdf of Y (HINT: define first fxy and the joint sample of X and Y). b. Find fxy(xly), the conditional pdf for X given Y. c. Are the event S=X ≤ Y and the random variable Y independent, i.e. is P(S|Y=y) = P(S)? What is the probability that the winner wins by less than 1 minute? Find the probability that the winning time is less than 6 minutes. d. e.
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