1. Ben is a student taking a statistic course. Ben does not revise his notes before class, does not do homework and regu

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1 Ben Is A Student Taking A Statistic Course Ben Does Not Revise His Notes Before Class Does Not Do Homework And Regu 1 (78.54 KiB) Viewed 30 times

1. Ben is a student taking a statistic course. Ben does not revise his notes before class, does not do homework and regularly misses class. Ben wants to rely on luck to pass the next test. The test consist of 10 multiple choice questions each question has 5 possible answers only one of which is correct. Ben plans to guess the answer to each question What is the possibility that Ben gets: a) At most 3 answers correct? b) 3 or more answers correct? [2 marks] [3 marks] 2. A textile producer has established that a spinning machine stops randomly due to thread breakages at an average rate/mean of 4 per hour. a) What is the probability that 3 stoppages will occur on this machine? [2 marks] b) What is the probability that at most 2 stoppages will occur? [3 marks) 3. The service time of the first service of a BMW is found to be normally distributed with the mean of 70 minutes and variance of 81 minutes. What is the probability that the job will take more than an hour and a half? [15 marks)