The following table gives the sex and age group of college students at a midwest

Question

The following table gives the sex and age group of college students at a midwestern university. A student is to be selected at random. The probability that the selected student is a female that is 15 to 17 years old is: A. 0.560. B. 0.593. C. 0.010. D. 0.005. A local politician claims that one in five automobiles accidents involve a teenaged driver. He is advocating increasing the age at which teenagers can drive alone. Over a two-month period there are 67 accidents in your city, and only nine of them involve a teenage driver. If the politician is correct, what is the chance that you would observe nine or fewer accidents involving a teenage driver? A. about 0.05 B. about 0.16 C. about 0.09 D. about 0.20

Explanation / Answer

Q10)

P(Female/ 15 to 17 years old)

= 89/150

= O.593

Option B is correct

Q11)

Sample proportion = 9/67= 0.1343

P (z<(0.1343-0.20)/Sqrt (0.20*0.80/67)

P(z<-1.3439)

= 0

= 0.09

Option C is Correct

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