If a class had 47.72% of its students fall between a mean of 70 and a score of 78, what was the standard deviation? Hint: Here the lower boundary of the range is given as the mean. Determine how many standard deviations (jumps from the men) are required to get the percentage under the curve. Divide range by that number of standard deviations. O 2 04 6 None of the answers listed 1 8