Can someone explain how to solve this kind of problem? My professor explained it but I'm a bit confused on how to solve it. Thank you in advance.

5. Compute the variances of the following two samples' datasets separately (NOTE: need to show all the steps of your computation based on the formula introduced in the lecture. No credit will be awarded if you simply give out an answer; and explain which data set has a more dispersed distribution. (4 pts) 1) Variance of the data set: 4 2 12 4 7 5 6 2) Variance of the data set: 43 35 28 17 15 43 16 3) Which dataset's distribution is more dispersed