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STAT 200 (34)
Lecture 5

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Department
Statistics
Course
STAT 200
Professor
Andrew Wiesner
Semester
Spring

Description
9/21/10 Week 5 Discrete Probability  Discrete Random Variable ­Discrete is something countable ­Random Variable is a numerical characteristic of each event in the sample space. Ex. Give grade point to exam score 0­F 1­D 2­C 3­B 4­A From previous exam we had the following counts: 4­ 135= 59%, 3­ 56 = 24%, 2­ 25= 11%, 1­ 7 = 3%, 0­ 6= 3%  Total is 100% Let x= Grade points Probability Distribution X 0 1 2 3 4 P(X=X) .03 .03 .11 .24 .59 Probability that X=X   P (x=2) Probability grade point is 2 Find P(X=3) Distribution probability table set probability for that outcome Cumulative probability gets difference for that outcome probability and the prior outcome probability  P (X<3) – P (X<2) Written P (X 3)= P (X 
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