Statistics Help

ro ems reae 0 ex s aper E If the results on a nationally administered introductory statistics exam are normally distributed with a mean of 65 points and a standard deviation of 4.5 points, determine the following: (a) Describe the graph of this distribution by telling the shape, naming the value at the peak, and giving the horizontal scale values three standard deviations to the left and three standard deviations to the right of the mean. (If you can do so, produce an electronic sketch of the graph to the right.) (b) Find the z-score for a single exam with a score of 58 points. Then nd the zscore for one with 70 points. (c) If x represents a possible pointscore on the exam, nd P(x > 70). (d) Find P (58