Answer Happy

4. (5 points) A random sample of graduates of Oakton is obtained, and they are surveyed about their happiness with their choice of Oakton. These results can be generalized to make statements about which group of people? (Choose only one answer.) A. Those who attended Oakton. B. Those who attended community colleges in the US. C. Those who graduated from Oakton D. Those who graduated from community colleges in the U.S. 5. (5 points) Suppose that a company makes a battery, and the lifespan on the batteries have a mean of u = 14.4 hours and standard deviation = 1.2 hours, normally distributed. If we select a random sample of n = 12 batteries, what is the probability that the sample would have a sample mean less than 13. 6. (16 points) Suppose that 34% of Oakton students have an evening or weekend class. If we ask 15 students at random, what is the probability that: (a) (4 points) exactly 5 have an evening or weekend class. (b) (4 points) 10 or more have an evening or weekend class. (c) (4 points) 6 or fewer have an evening or weekend class. (d) (4 points) at least one has an evening or weekend class.