What percent of the twelfth-grade students who drive said

Question

Refer to Exercise. Students also were asked what grades they usually get in school. For twelfth-grade students who responded to this question and the question about how often they wear seatbelts when driving, a summary of frequency counts for combinations of responses to the two questions is as follows:

	Usual School Grades
Wears Seatbelt	A snd B	C	D and F	Total
Never	52	32	18	102
Rarely	128	93	22	243
Sometimes	166	104	8	278
Most times	298	128	24	450
Always	1056	300	41	1397
Total	1700	657	113	2470

a. The total number of students in the table is 2470. What percentage of these 2470 students said that they usually get A's and B's in school?

b. What percentage of the 1700 students who said that they usually get A's and B's said that they always wear a seatbelt when driving?

c. What percentage of the 657 students who said that they usually get C's said that they always wear a seatbelt when driving?

d. What percentage of the 113 students who said that they usually get D's and F's said that they always wear a seatbelt when driving?

Exercise
Table 2 summarized frequency of seatbelt use while driving for twelfth-grade participants in the 2003 Youth Risk Behavior Surveillance System (YRBSS) survey. In 2001, YRBSS survey students were asked the same question. For the 2001 survey, a summary of responses given by 2530 students in the twelfth grade who said that they drive follows.

Wears Seatbelt	Frequency
Never	105
Rarely	248
Sometimes	286
Most times	464
Always	1427

a. What percent of the twelfth-grade students who drive said that they always wear a seatbelt when driving?

b. What percent of the twelfth-grade students who drive said that they do not always wear a seatbelt when they drive?

c. Find the percentage in each of the five response categories.

d. Draw a bar graph of the percentages found in part (c).

Table 2: Seatbelt Use by Twelth-Graders When Driving
Response	Count	Percent
Always	1686	55.40%
Most times	578	19.00%
Sometimes	414	13.60%
Rarely	249	8.20%
Never	115	3.80%
Total	3042	100%