A researcher talks with 20 heroin addicts to find out how many times they have shoplifted in the past week. The data are shown below:
1, 6, 0, 0, 4, 0, 3, 4, 14, 9, 3, 0, 1, 1, 2
A) What is the mean and standard deviation for known incidents?
B)What is the z score for an addict who shoplifted four times?
C)What is the percentage of heroin addicts that have shoplifted four or more times?
D)What is the z score for an addict who shoplifted once in the past week?
E)What percentage of addicts shoplifted 1 or fewer times in the past week?