Question 14 4 pts 9 1 1 Details The graph of a normally distributed random variable is given. Use the graph to answer the questions that follow. 40 44 48 52 56 60 64 a. What is the mean? b. What is the standard deviation? c. Which value has a z-score of 3? d. To the best of your ability, explain your answer to part C. (You can resize the answer box below if you need more space.)