A local teacher's education association decides to hold a raffle. They are going to sell 500 tickets for $20.0?

6. A local teacher's education association decides to hold a raffle. They are going to sell 500 tickets for $20.00 each. 1st Prize is a $5000 scholarship, 2nd Prize is a $1000 scholarship, and the 3rd Prize is a $500 scholarship. You decide to purchase $100 worth of tickets. What are your expected winnings?

A) 39

B) -35

C) 35

D) .035

7. Consider a density curve of a uniform continuous random variable with a minimum value of 4 and a maximum value of 9. What is the average height of the density curve?

A) 1

B) 20

C) .09

D) .20

E) .25

9. One hundred students took a test on which the mean score was 73 with a variance of 64. A grade of A was given to all who scored 85 or better. Approximately how many A's were there, assuming scores were normally distributed? (Choose the closest.)

A) 42

B) 7

C) 58

D) 5

E) 22

10. If a normal distribution has mean 200 and standard deviation 20, find K so that the probability that a sample value is less than K is .975.

A) 204

B) 230

C) 239

D) 243

MY ANSWERS!!!::::

6. A

7. E

9. A

10. C