1. Stock prices. For the 300 trading days from January 11, 2012 to March 22, 2013, the daily closing price of IBM stock (in $) is well modeled by a Normal model with mean $197.92 and standard deviation $7.16. According to this model, what is the probability that on a randomly selected day in this period the stock price closed
a. above $205.08
b. below $212.24
c. between $183.60 and $205.08
d. Which would be more unusual, a day on which the stock price closed above $206 or below $180
2. Stock prices, again. According to the model in Exercise 26, what cutoff value of price would separate the
a. lowest 16% of the days
b. highest 0.15%
c. middle 68%
d. highest 50%