Suppose we are interested in bidding on a piece of land and we know one other bidder is interested. The seller announced that the highest bid in excess of $10,400 will be accepted. Assume that the competitor's bid x is a random variable that is uniformly distributed between $10,400 and $15,100. Suppose you bid $12,000. What is the probability that your bid will be accepted

15100 - 10400 = 4700

Say there are 4700 possible bids (assuming you can only bid in whole dollar amounts). There is a 1 in 4700 chance that they will bid exactly your amount.

11999 - 10400 = 1599

There is a 1599 in 4700 chance that they will bid lower.

15100 - 12001 = 3099

There is a 3099 in 47000 chance they will bid higher.

That should get you started...