Question Completion Status: 0.4 points Saved QUESTION 6 front of the room and 2

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Question Completion Status: 0.4 points Saved QUESTION 6 front of the room and 2 deaks in the second Amy, Billy, Charie, Danieile, Emly, and Fred are students in Mrs. Steel's 3rd grade class. She has 4 desks in the row. How many different ways can she arrange the students in the FRONT row? 0.4 points Save Answer QUESTION 7 Amy ealy Charike, Dacro suents in Mrs. Stoi's 3ard grade class. Mrs. Steel wants to select 2 of them to lead the group in a class exercise that day. How many different ways can she do this? 0.4 points Saved QUESTION 8 The Empirical Ruile states that, for a distribution that is symmetrical and beli-shaped, such as the normal distribution, approximately 68 of the data values will fall within 1 standard deviation of the mean, approximately 9 deviations of the mean, and approximately 99.7 % of the data values will fall within 2 standard % of the data values will fall within 3 standard deviations of the mean. QUESTION9 0.4 points Save Answer One research study indicated that approximately 10% of all businessmen who wear ties wear them so tight that the ties actually reduce blood flow to the brain. At a board meeting of 25 businessmen, all of whom wear ties, what is the probablity that at least one tie is too tight? Express your answer as a proportion and round to 2 decimal places

Explanation / Answer

6) number of ways to select 4 out of 6 and then arrange them in order =6P4 =6!/(6-4)! =6*5*4*3=360

7) number of ways to select 2 out of 6 =6C2 =6!/(2!*4!) =15

8) all correct

9) probability =1-P(none has tie too tight) =1-(0.9)25 =0.93

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