Calculate the sample variance and sample standard deviation for the following frequency distribution of heights in centimeters for a sample of 8-year-old boys. If necessary, round to one more decimal place than the largest number of decimal places given in the data.

Heights in Centimeters Class Frequency 120.6 - 123.6 17 123.7 - 126.7 49 126.8 - 129.8 29 129.9 - 132.9 41 133.0 - 136.0 35