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Of the last three chapter tests given in a computer programming class, 11 students passed all...

Of the last three chapter tests given in a computer programming class, 11 students passed all three tests, 9 students passed two tests, and 2 students passed one test. If a single student is picked at random, what is the probability that the student passed all three tests or passed one test? Provide the final answer as a fraction. A= 13/22

Math   Statistics-And-Probability   
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Answer #1

Total number of students = 11+9+2 = 22

Probability that a student passed all three tests = (Number of student who passed all three tests Total number of students)

Probability that a student passed all three tests =

Probability that a student passed one test = (Number of student who passed one test Total number of students)

Probability that a student passed one test =

As the events a student passed all three tests and a student passed one test are disjoint so,

the probability that the student passed all three tests or passed one test = =

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