Question 507810
Problems 10, 11, 12, and 13 below refer to the "cognitive ability" scores for a sample of students: 
Cognitive Ability Relative Frequency 
90 ---- 0.08 
95 ---- 0.21 
100 ---- 0.04 
105 ---- 0.15 
110 ---- 0.07 
115 ---- 0.18 
120 ---- 0.05 
125 ---- 0.22 
Total 1.00 

Problem #10: 
What is the estimated probability that a randomly selected student from the sample has a score that is more than 115?:::0.27
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Problem #11:
What is the estimated probability that a randomly selected student from the sample has a score that is 110 or more?::::0.52
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Problem #12:
What is the estimated probability that a randomly selected student from the sample has a score that is 105 or less?:::0.48
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Problem #13:
What is the estimated probability that a randomly selected student from the sample has a score that is less than 115?:::0.55

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Cheers,
Stan H.