Homework Help: roll dice

Posted by sonney32 on Saturday, April 16, 2011 at 1:24pm.

Event A you roll the die and it's even
Event B you roll the die and it's less than 5

Roll the die once. What is the probability that Event A will occur given that Event B has alrady occured?

would it be 3/4 = .75 or 75% not sure need help
and,

Roll the die once. what is the probability that Event B will ocurr given that Event A has already occured?

would this be 4/3 =1.33 I do not think this is right. I would appreciate it if someone could help me out on how you figure something like this out.

Thanks

roll dice - PsyDAG, Sunday, April 17, 2011 at 11:41am
Since the rolls of the die are independent, they do not influence subsequent events.

Event A = 3/6 = .5

Event B = 4/6 = .67
roll dice again - PsyDAG, Sunday, April 17, 2011 at 11:43am
Since the rolls of the die are independent, they do not influence subsequent events. If previous events occur by chance, they do not change the probability of whatever occurs next.

Event A = 3/6 = .5

Event B = 4/6 = .67

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