1. A severe drought affected several western states for 3 years. A Christmas tree farmer is worried about the drought's effect on size of his trees. To decide whether the growth of the rees has been retarded, the farmer takes a sample of the heights of 15 trees and obtains the following results ( in inches) : 60, 57, 62 69 46, 54,64, 60, 58, 75, 51, 49, 67, 65, 44
a) Create a split stem-and-leaf plot.
b) 25% of the heights are above what value?
c) Calculate the mean and standard deviation for the data
2. The distribution of the playoffs at a racetrack has a mean of $5.85 and a median of $3.40. We can conclude :
a) More than half the winners get less than a $3.40 payoff
b) More than half the winners get lessnthan $5.85 paoff
c) The distribution of payoffs is symmetric
d) The distribution of payoffs is left-skewed