need the answer for these numbers for variance and standard deviation for an ungrouped frequency distribution. also variance fand standard deviation from grouped distribution using the class of 25-29 for the lowest interval. value for -1sd and +1sdand the actual percentage of cases that fall within this range. the number in the equation is 81, 79, 78, 76, 74, 73, 70, 69, 68, 65, 64, 63, 62, 60, 59, 58, 57, 56, 55, 49, 48, 47, 45, 44, 41, 39, 38, 34, 30, 28.