Question

Hello,
I am taking a math class online and the class includes four exams each worth 15% towards the final grade. I took one already and got 25% out of 100%. I have three left. homework is worth 20% towards the final. And the final is 20% toward the grade. so all the percentage added up is 100% but if I already have 25% out of 100% on one exam and I have three left what is the probability of passing with a B ?

20150519 Micayla Coquia 
