5 A violin student records the number of hours she spends practicing during each of nine consecutive weeks: 6.2 5.0 4.3 7.4 5.8 7.2 8.4 1.2 6.3 What is the mean number of hours spent practicing per week during this period? 5.76 hours 6.15 hours 8.40 hours 6.20 hours 5 points A description of different houses for sale includes the square footage of the house, whether or not the house has a finished basement, and the monthly electric bill. Which of the variables is categorical? the monthly electric bill the square footage of the house whether or not the house has a finished basement All of the answer options are correct. 6 5 points Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 12 oz. The proportion of infants with birth weights above 125 oz is: 0.233. 0.141. 0.159.