Question

question 1

A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sample of 651 adults, asked those adults about their party affiliation (Democrat, Republican or none) and their opinion of how the US economy was changing ("getting better," "getting worse" or "about the same"). The results are shown in the table below.

	better	same	worse
Republican	38	104	44
Democrat	12	87	137
none	21	90	118

Express your answers as a decimal and round to four decimal places.

If we randomly select one of the adults who participated in this study, compute:

a. P(Republican) =  

b. P(worse) =  

c. P(worse|Republican) =  

d. P(Republican|worse) =  

3. P(Republican and worse) =

Question 2.

Private nonprofit four-year colleges charge, on average, $27,752 per year in tuition and fees. The standard deviation is $7,329. Assume the distribution is normal. Let X be the cost for a randomly selected college. Round all answers to 4 decimal places where possible.

a. What is the distribution of X? X ~ N(,)

b. Find the probability that a randomly selected Private nonprofit four-year college will cost less than 28,853 per year.

c. Find the 78th percentile for this distribution. $ (Round to the nearest dollar.)

Answer 1