4. Suppose during the month of January 2016, the mean closing price of Disney stock was $97.29 with a standard deviation $3.15. During the same period, the mean closing price of Ford stock was $12.06 with a standard deviation of $0.57. If on January 7th Disney stock closed at $93.90 and Ford stock closed at $11.58, which stock performed better on that day relative to the other days of January? Justify your answer.