My alarm clock wakes me up only 64% of the time. My probability class meets at 8:30

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My alarm clock wakes me up only 64% of the time. My probability class meets at 8:30 am, and if I don't hear my alarm, I'll miss class. My teacher takes off one percent of our grade for every class that we miss. Let X be the number of class days that pass until I have lost 10% of my grade.
a. What is the expected value of X?
b. What is the probability that X is 30?
c. If there are 48 class days over the semester, what is the probability that I will have lost only 9% of my grade? What distribution is this? How do you know?
d. Let Y be the number of days until I lose my first percentage off my grade. What distribution is this? How do you know? Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
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Introduction to Probability

ISBN: 978-0716771098

1st edition

Authors: Mark Daniel Ward, Ellen Gundlach

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