Practice before Test 2 (this is not graded assignment) 1. Two jurors should be selected out of 4 male and 5 female candidates. Find the probability that both selected jurors will be female (First selected juror is female and second female again). 2. In how many different ways 6 teams can finish the season with some team be in the first place, some team – on second place and some team – on third place. Order of the first three positions is matter. 3. In how many different ways can we select 4 people out of 9 candidates to be hired for the same position? (Order of selection doesn’t matter) 4. What is the probability that randomly taken card from the full deck of cards will be Diamond or Queen? 5. Find probability that randomly selected person from this group is female? 6. Find probability that randomly selected person from this group is Female or likes Coffee. 7. Prob. that person likes Coffee is 0.55. Prob. that person likes Tea is 0.25. The probability that person likes Coffee AND likes Tea is 0.10. Find probability that person likes Coffee OR likes Tea. 8. Find probability that randomly selected person from this group likes Coffee IF person is female. Tea Coffee Male 6 14 Female 10 20 Tea Coffee Male 10 15 Female 5 20 Based on the given data, what is the prob. that person likes Coffee OR Tea? 0.70 Tea Coffee Male 40 10 Female 30 20 MAT2215 Statistics I 9. There were 25 tickets in a box, 4 of them are winning tickets. First 5 taken tickets are not winning. What is the probability that next taken ticket will be winning ticket? 10. Write equation of line that has y-intercept= 5 and slope = –4 . 11. Calculate x-mean () and y-mean () for the following data, complete the table and find the value of Sxy and Sxx: Sxy = Sxx = 12. Use results from problem #10 and write the equation of Regression Line in the form: y = bo + b1x x y x- y- (x-)(y-) (x-)2 1 10 3 14 4 16 8 20

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