I'm assuming this is from the AQR unit4 lesson 4 quiz?The answer to your question is .9However I'm also going to drop the rest of the answers to the quiz since I just finished it.
1) Suppose Ruth Ann...
15
2) Verne has 6 math books696
3) 7C6
7
4) 3 singers... from 510
5) 8 red, 4 white, 5 blue0
6) Spinner... 1 through 10... less than 2 or greater than 72/5
7) The radius of each concentric circle is 4 inches more...3/16
8) First urn contains 9 white balls... Second urn contains 8 white balls4/11
9) Land on an upper case letter or consonant0.9
10) Joey's sock drawer... 3 black dress socks, 5 black ankle socks...16/21
11) Survey of students in two math classes... |3rd period class| 11yes 6no, |6th period class| 13yes 10no0.565
12) City bus is ready for service when needed is 84%79.8%
13) A class of 40 students has 11 honor...0.241
14) Are rolling a 4 and rolling a 3 mutually exclusive eventsYes they are. Mutually exclusive means they cannot happen at the same time, and because you only get one number by rolling a cube once, you cannot get 3 and 4 at the same time.
15) Participants in a study of a new medication... -----80% Medication -----76% improvement -----24% no improvement ------20%Placebo --------62% no improvement -----------38% improvement Solving for P(placebo and improvement) = .20 x .38 = 0.076 = 7.6%
My answers for 14 and 15 havent been graded yet, but I'm fairly confident their right.