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nternet can contain viruses. Unless you need to cull its saler t lay in Ploteieu vlew 5. A statistics professor wishes to find out the relationship between the classification of a student and the students' grade in the course. The following is a breakdown of the grades and classification of students in three sections of the course. (Hint: Transform the raw data below into marginal and joint probabilities) Grade First Year Sephomore Junior Senior 12 Find: The probability that a randomly selected student makes a D or F in the course. The probability that a randomly selected student is a junior and makes at least a B in the course. Given that we have randomly selected a senior, what is the probability that they will not make an A in the course? a. b. c. 6. A local super market has installed a self-service checkout counter. If X is the number of customers who check out through self-service during a 10 minute peried and we assume that the conditions of the Poisson random variable are satisfied with a mean of 6 customers per 10 minute period, what is the probability that

Explanation / Answer

5) from above table:

a) probability to make a D or F =(11+9)/100=20/100=0.2

b)probability of Junior and making at least B =(9+8)/100=0.17

c)probability of not making an A given senior =(11+12+4+1)/38 =0.7368

grade first Year Sophomore Junior Senior Total A 0 7 9 10 26 B 0 6 8 11 25 C 1 7 9 12 29 D 2 4 1 4 11 F 0 6 2 1 9 total 3 30 29 38 100

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