5. It was found that 45% of people surveyed prefer tea, while 55% of people surveyed prefer coffee. Myra creates random samples of the population using cards numbered 1 to 20. Which range of

numbers could be used to represent people who prefer coffee?

A. 1 to 9

B. 1 to 11

C. 9 to 10

D. 11 to 20

Find x & pleassse me !

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.