27. Table 1 below summarizes the students' response to whether they have tried marijuana at least once in their lifetime.

	Tried marijuana at least once
Age	Yes	No	Total
12-13	4	33	37
14-15	7	23	30
16-17	9	24	33
Total	20	80	100

What is the probability that a student is 14-15 and has tried marijuana at least once

a. 0.20

b. 0.30

c. 0.30

d. 0.07

28. Table 1 below summarizes the students' response to whether they have tried marijuana at least once in their lifetime.

	Tried marijuana at least once
Age	Yes	No	Total
12-13	4	33	37
14-15	7	23	30
16-17	9	24	33
Total	20	80	100

What is the probability that a student is 14-15 or has tried marijuana at least once

a. 0.30

b. 0.47

c. 0.43

d. 0.53