Solve both questions

1. Given the following data: 3, 4, 4,3, 5,3 Calculate the sample variance (Write down the detailed steps). (10 points) 2. For the following data set, construct a stem-and-leaf plot by hand. (10 points) 4.5, 4.8, 4.7, 5.0, 4.8, 4.1, 3.7, 4.0, 3.8, 4.0, 5.7, 5.9,5.7, 5.8, 6.0, 4.8, 4.6, 4.8, 5.0, 4.8, 6.6, 6.1, 6.4, 6.4, 6.3, 4.9, 5.1, 5.1, 5.1, 5.3, 6.9