77, 45, 72, 56, 98, 60, 70, 89, 50, 80, 95, 70, 34, 77, 65, 70, 70, 82, 86, 86 part 1: find the standard deviation of the scores. round the final answer to two decimal places. be sure to show all work. part 2: what percentage of the scores are within one standard deviation of the mean (±1)? include the range of values for this deviation and the exact values from the data set that are included in this range. part 3: what percentage of the scores are within two standard deviations of the mean (±2)? include the range of values for this deviation and the exact values from the data set that are included in this range. part 4: does this data fit the model of a normal distribution? why or why not?