Please answer all

12. Please create a graph that depicts two normal curves that possess the same mean but different standard deviations. Then provide a graph that depicts two normal curves that possess the same standard deviation but different means. Provide logical mean and standard deviation values on each of these two graphs. 13. Using the following discrete data, please calculate the mean and standard deviation. Show your calculations. Hint: These are non-constant probabilities and you need four more columns. (X) Number of Items on Pizzas 3(3) 0 .15 1 .15 2 .20 3 .25 4 or more 14. Suppose the average number of work hours per year, for your employees, has been 2,000 hours with a standard deviation of 165 hours. Please graph and calculate the probability that any random employee that you observe, will work between 1,900 hours and 2,450 hours next year. Hint: Two ZS and be ready to add