Question

1.Multiple-choice questions each have

four possible answers left parenthesis a comma b comma c comma d right parenthesis(a, b, c, d),

one of which is correct. Assume that you guess the answers to three such questions.

Use the multiplication rule to find P(CWW), where C denotes a correct answer and W denotes a wrong answer

P(CWW)equals=

2.Assume that random guesses are made for 3 multiple-choice questions on a test with 5 choices for eachquestion, so that there are N equals=3 trials, each with probability of success (correct) given by

P equals=0.20.

(Trials: 3 0) .970 .857 .729 .512 .343 .216 .125 .064 .027 .008 .001 0+ 0+ 0 3

       * 1 .029 .135 .243 .384 .441 .432 .375 .288 .189 .096 .027 .007 0+ 1 *

       * 2 0+ .007 .027 .096 .189 .288 .375 .432 .441 .384 .243 .135 .029 2 *

        * 3 0+ 0+ .001 .008 .027 .064 .125 .216 .343 .512 .729 .857 .970 3 *

Find the probability of no correct

answers.

(Round to three decimal places asneeded.)

3.Assume that when adults with smartphones are randomly selected, 52%

use them in meetings or classes. If 20 adult smartphone users are randomly selected, find the probability that exactly 14 of them use their smartphones in meetings or classes.

The probability is

nothing .

(Round to four decimal places as needed.)

Answer 1