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6 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 O All of the answer options are correct O O 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 O 0 233 0 141 0 159