MATH STATS PLZ Help!!!?

Question by Drea: MATH STATS PLZ Help!!!?
2.In an Intro Stats class, 57% of students eat breakfast in the morning and 80% of students floss their teeth. Forty-six percent of students eat breakfast and also floss their teeth.

What is the probability that a student from this class eats breakfast but does not floss their teeth?
A.
34%
B.
9%
C.
91%
D.
11%
E.
57%

3.At a California college, 22% of students speak Spanish, 5% speak French, and 3% speak both languages. What is the probability that a student chosen at random from the college speaks Spanish but not French?
A.
0.02
B.
0.24
C.
0.17
D.
0.19
E.
0.2

6.A local country club has a membership of 600 and operates facilities that include an 18-hole championship golf course and 12 tennis courts. Before deciding whether to accept new members, the club president would like to know how many members regularly use each facility. A survey of the membership indicates that 57% regularly use the golf course, 48% regularly use the tennis courts, and 9% use both of these facilities regularly. Given that a randomly selected member uses the tennis courts regularly, find the probability that they also use the golf course regularly.
A.
.4737
B.
.1875
C.
.7164
D.
.1343

8.Suppose that you know that A and B are independent events, that is the outcome of event A does not affect the outcome of event B and vice versa. P(A) = 0.3 and P(B) = 0.7. Find P(A|B) that is, P(A given B).
A.
P(B) = 0.7
B.
P(A) = 0.3
C.
P(A)/P(B) = 0.429
D.
P(B)/P(A) = 1.33

9.In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question “Have you ever used cocaine?” in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this survey of 2400 students. Suppose one subject is randomly selected from this group. Find the probability that the subject answered “No.” Show this answer as a fraction. Do not attempt to reduce the fraction.
Survey Method NO YES TOTAL
Anonymous 576 224 800
Personal 600 200 800
Phone 632 168 800
Total 1808 592 2400

Answer

10.In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question “Have you ever used cocaine?” in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this survey of 2400 students. Suppose one subject is randomly selected from this group. Find the probability that the subject answered “Yes” and participated in a phone interview. Show this answer as a fraction. Do not attempt to reduce the fraction.
Survey Method NO YES TOTAL
Anonymous 576 224 800
Personal 600 200 800
Phone 632 168 800
Total 1808 592 2400

Answer

Best answer:

Answer by Julius N
2. In an Intro Stats class, 57% of students eat breakfast in the morning and 80% of students floss their teeth. Forty-six percent of students eat breakfast and also floss their teeth.
What is the probability that a student from this class eats breakfast but does not floss their teeth?
57%-46% = 11%

3. At a California college, 22% of students speak Spanish, 5% speak French, and 3% speak both languages. What is the probability that a student chosen at random from the college speaks Spanish but not French?
22% – 3% = 19%

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