Please I need some help with these problems and would like to understand the concept.

The length (pgs) of math research projects is given in the sample below. Using this information, calculate the range, variance, and standard deviation. 22, 29, 21, 46, 35, 20, 53, 13, 39, 20, 25 Remark: Use at least two decimal places in your computations. range = variance = standard deviation =(1 point) (a) Find the mean and median for the following data. 80, 56, 72, 15, 59, 66, 10, 68, 25, 63 Mean = Median = (b) Fill in the table below to demonstrate each of the steps in finding the standard deviation. Put one number in each blank. Do not round any quantities. x 26)? (xJ'c)2 (c) Find the sum of the squared deviations from the mean, sample variance, sample standard deviation, population variance, and the population standard deviation of the data set. If necessary, round quantities to 4 decimal places. For example, 12.34567 becomes 12.3457. Sum of the squared deviations from the mean 2(x 502 = Find the sample variance 2(xJ'c)2 _ nl _ Using your answer for the sample variance, find the sample standard deviation Eva502 nl ) = Population variance 206-? N Using your answer for the population variance, find the population standard deviation WHEN?) =