# A. What the mean and standard deviation (SD)

Question

# 1. A. What the mean and standard deviation (SD) of the Close column in your data set?B. If a person

bought 1 share of Google stock within the last year, what is the probability that the stock on that day closed at less than the mean for that year? Hint: You do not want to calculate the mean to answer this one. The probability would be the same for any normal distribution. (5 points)

2. If a person bought 1 share of Google stock within the last year, what is the probability that the stock on that day closed at more than $600? (5 points)

3. If a person bought 1 share of Google stock within the last year, what is the probability that the stock on that day closed within $45 of the mean for that year? (5 points)

4. Suppose a person within the last year claimed to have bought Google stock at closing for $450 per share. Would such a price be considered unusual? Use the definition of “unusual” from the course textbook. (5 points)

5. At what prices would Google have to close in order for it to be considered statistically unusual? You will have a low and high value. Use the definition of “unusual” from the course textbook that is measured as a number of standard deviations. (5 points)

6. What are Quartile 1, Quartile 2, and Quartile 3 in this data set? Use Excel to find these values. This is the only question that you must answer without using anything about the normal distribution. (5 points)