5. A research group wishes to know the average salary of an engineer working in the United States. The group surveys 134 engineers working at various US companies , and finds the average salary of those surveyed is $68,268 . a. What is the popuiation being studied ? b. What is the parameter of interest ? c. What is the sample ? cl. What is the value of the statistic ? 6. Write out the sample space for the following probability experiment :Two marbles are selected without replacement from a bag containing one green , one red , and one blue marble . 7. A random sample of 300 adults who recently purchased a new make of car was classified by gender and whether or not they purchased a car with a hybrid engine . The results are listed in the table below . . If a person is selected at random from the 300 adults , find : a. The probability they are male or purchased the hybrid engine . b. The conditional probability they purchased a hybrid engine given they are female . 8. Lindsay is checking out books at the library , and she is primarily interested in mysteries and nonfiction . She has narrowed down her selections down to 4 mysteries and 5 nonfiction She has decided she will check out exactly 3 of these books . a. How many different combinations of books can she check out if she wants them all to be nonfiction ? b. How many different combinations of books can she check out if she wants 1 mystery and 2 nonfiction? 9. An urn contains 1 red and 3 white balls. Two balls will be randomly seiected ,with replacement . If Xequals the number of red balls in the sample ,find the probability distribution for X