mean and variance of these

Question

1.30, 1.31, 1.11, 1.08, 1.09, 1.13, 1.65, 1.26, 1.26, 1.18

Answer 1

variance=0.025801 for a population of 10

variance=0.0286677..for a sample of 10

mean=1.237 for either population or sample

Take the 10 numbers, sum them, then divide by 10 to get the mean.

sum the squared differences of each value minus the mean. Then divide by 10 or by 9

defending on whether the 10 values are from a population of 10 or a sample of 10

It's easy to make a mistake. Calculating by hand is tedious. Above answers come from a free online statistics calculator. There are several on line.