professor prob...round final to 4 decimal

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Tutor: None Selected Time limit: 1 Day

9 students in a class of 36 will cheat...teacher focus on 11random students 

A. find prob 1 student cheat

B. find prob at least 1 cheat while teacher focus on 12 random students

Feb 13th, 2015

n = number of students = 11

p =Probability of cheating = 9/36 =0.25

A. 

P ( 1 student cheat | n =11, p =0.25) = 11C1 (0.25)1(0.75)10 = 0.154862= 0.1549

B. 

P ( 0 will cheat | n=12, p=0.25)= 12C0 (0.25)0(0.75)12 = 0.031676

P ( at least 1 cheats) = 1-0.031676 =0.968324 = 0.9683

Feb 13th, 2015

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