Suppose that 30% of all students who have to buy a text for a particular course want a newcopy (the successes), whereas the other 70% want a used copy. Consider randomly selecting 25purchasers.(a)[3 pts]Find the mean and standard deviation of the number of students who want a newcopy of the book.

Step-by-step explanation:

We know that  30% of all students who have to buy a text for a particular course want a newcopy, whereas the other 70% want a used copy. So, we get that:

p=30%=0.3

q=70%=0.7

n=25.

We calculate the mean:

We calculate the standard deviation:

We get that the mean and standard deviation are:

17. a  18. c   19. d   20. b

Step-by-step explanation:

Hello, for the first question, you just take the person with the largest number and the person with the smallest number. Kenny (5) and Sammy (0).

For question 18, you just add up all the numbers like this:

0+1+3+5+4+1+1+2+1= 18

And then you divide it by the number of people there which is 9:

18/9=2

For question 19, you arrange all the numbers from least to greatest like this:

0,1,1,1,1,2,3,4,5

And then you count on both ends until it meets the middle. 1 is the middle.

For the last question, you just find the number that appears the most, which is one.