Find the probability that a normal standard variable is less than or

Problem 1

 

 

 

Problem 2

 

 

Problem 3

1. Find the probability that a normal standard variable is less than or equal 0.

 

2. Given a normal distribution with  = 3 and  = 0.5, find the probability that X assumes

a value less than or equal 2.3.

Problem 4

9 friends decide to  “go  for  a  drink”   after an exam. What is the probability that the waitress will refuse to serve alcoholic beverages to only 2 minors if she randomly checks the IDs of 5 students from among 9 students of which 4 are not of legal age?

 

 

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