The probability that a student forget to do their homework is 5% independently of other students. If at least one student forgets to do homework, the whole class have to sit a test.
a) There are 12 students in a class. Find the probability that the class will have to do a test.
b) Using the expression 1-(0.95)n find the smallest number of students in the class such that the probability that the class wil have to do a test is at least 80%
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- Thread Starter
- 06-11-2017 14:57
- 06-11-2017 15:00
the answer to part a) is pretty much given to you in part b)