Posted by **Anonymous** on Monday, November 7, 2011 at 1:40pm.

18. Please answer questions 18-19 using the following information:

Class Scores Frequency - f

Lower limit < score < upper limit

20-30 6

30-40 10

40-50 12

50-60 8

60-70 4

What is the probability that a selected observation is between 40 and 50?

(Points: 5)

0.25

0.30

0.40

0.65

19. What is the probability that a selected observation is greater than 39, but less than 60? (Points: 5)

0.20

0.40

0.30

0.50

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