Hi

Trouble only because Totals hadn't been filled in:

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

Tot______50______29________21 

P(A|B) = P(A and B)/P(B)

P(A |  ≤ 8) =    = 1/21 = .05 rounded 

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