4) Assume that a stock's price varies according to standard Brownian motion ( with time measured in days ) Note: For each part of this problem, you can either compute the exact answer or estimate it using a computer ( with error bars ). We prefer the exact answer , if possible a ) You bought the stock today for $100. What is the probability that in 2 days the stock price will be at least $ 102 ? 6) You bought the stock today for $100 What is the probability that over the next 2 days, you can sell the stock for at least $102 ? ( ) You are interested in the chance of large price swings Let Y be the stock price in one day Z be Compute the probability that " two days 27100 2