In a survey, 70% of Americans said they own an answering machine. If 5 Americans are selected at random:
a. Find the probability that exactly 3 own an answering machine;
b. Find the mean number of people who own an answering machine.;

The correlation coefficient between the number of students and marks obtained in end semester exam. (13 marks) give the statistical meaning of the relationship between the number of students and marks b. obtained in end semester exam. (3 marks) draw the number of students and marks obtained in end semester exam scatter diagram c. (4 marks) check list write your name and id corectly write the question number properly use your own calculator. show all the steps to solve the problems. use the correct formula. answer in provided time. don't use your mobile for any purpose. write your answer up to two decimal places