Question 886377: Problem:
Grade___Students__>8 HRS.__<8 HRS.
A_______13_______12_______1
B_______10_______8________2
C_______8________6________2
D_______9________2________7
F_______10_______1________9
What is the probability of a randomly selected student having earned an A or a B on the exam given they devoted more than 8 hours to studying for the exam?
a. 0.57
b. 0.47
c. 0.69
d. 0.76
I would need the answer (a,b, c or d) plus how to arrive at the answer so I can apply that to similar problems. This is so confusing. Thank you for your help!
Answer by rothauserc(4718)   (Show Source):
You can put this solution on YOUR website! There are 29 students who studied more than 8 hours, of those students 20 got an A or a B, therefore
therefore probability is 20/29 = 0.689655172 = 0.69
answer is c
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