tries to unlock the door with it. She continues in this manner until the door is unlocked. Let X be the number of keys she tries before unlocking the door, counting the key that actually worked. a. Find the pmf. b. Graph the probability function of X c. Graph the cdf of X

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A woman has eight keys on a key ring, one of which fits the door she wants to unlock. She randomly selects
a key and tries it. If it does not unlock the door, she randomly selects another key from those remaining and
tries to unlock the door with it. She continues in this manner until the door is unlocked. Let X be the number
of keys she tries before unlocking the door, counting the key that actually worked. a. Find the pmf. b.
Graph the probability function of X c. Graph the cdf of X
Transcribed Image Text:A woman has eight keys on a key ring, one of which fits the door she wants to unlock. She randomly selects a key and tries it. If it does not unlock the door, she randomly selects another key from those remaining and tries to unlock the door with it. She continues in this manner until the door is unlocked. Let X be the number of keys she tries before unlocking the door, counting the key that actually worked. a. Find the pmf. b. Graph the probability function of X c. Graph the cdf of X
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