Question 1117176
a) Probability selected student obtained a B = 25/50 = 1/2
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b) Probability selected student obtained a B or a C = 25/50 + 15/50 = 40/50 = 4/5
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c) Probability selected student did not obtain a D = 1 - 5/50 = 45/50 = 9/10
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d) Probability selected student did not obtain a B or a C = 1 - 4/5 = 1/5
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