An energy study found that household use of electricity had a mean of 682 and a standard deviation of 551 kilowatt-hours. Complete Next question Click here to view page 1 of the standard normal table. Click here to view page 2 of the standard normal table. a. Suppose the distribution of energy use was normal. Using a table, calculator, or software that can give normal probabilities, find the proportion of households with electricity use greater than 1000 kilowatt-hours. The proportion of households with electricity use greater than 1000 kilowatt-hours is |. (Round to the nearest hundredth as needed.) b. Based on the mean and standard deviation given, do you think that the distribution of energy use actually is normal? Why or why not? No, the distribution of energy use does not appear to be normal since 0 has a z-score of only (0 - 682) / 551 = - 1.24, yet energy use cannot be negative. Yes, the distribution of energy use appears to be normal since the value 682 - 551 = 131 is positive. Time Remaining: 00:31:03 Submit quiz DI 20 888 F7 FB F3 FA F6 esc # 4 5 6 8 2 3 P U W R TFind the z-scores that separate the middle 40% of the distribution from the area in the tails of the standard normal distribution. The z-scores are. (Use a comma to separate answers as needed. Round to two decimal places as needed.) 44 20 FA F5 F3 esc F1 /o 4 15 2 3 Rwhich graph is which and explain how you know. One graph in the figure represents a normal distribution with mean u = 11 and standard deviation o = 3. The other graph represents a normal distribution with mean u = 15 and standard deviation o = 3. Determine Choose the correct answer below. O A. Graph A has a mean of H = 11 and graph B has a mean of H = 15 because a larger mean shifts the graph to the left. O B. Graph A has a mean of u = 11 and graph B has a mean of J = 15 because a larger mean shifts the graph to the right. C. Graph A has a mean of u = 15 and graph B has a mean of H = 11 because a larger mean shifts the graph to the left. O D. Graph A has a mean of H = 15 and graph B has a mean of u = 11 because a larger mean shifts the graph to the right. Time Remaining: 00:30:30 Next esc 20 F1 @ * # 2 Q W E R T Y U O P tab K A S D F G H caps lock B N