college math
posted by Anonymous .
18. Please answer questions 1819 using the following information:
Class Scores Frequency  f
Lower limit < score < upper limit
2030 6
3040 10
4050 12
5060 8
6070 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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