Please help me understand this attached sheet. Thank you

For the following sample of scores, compute the (a) mean, (b) variance, and (c) standard deviation: 12. 14, 15, 18, 22, 25, 26, 30. For a population with a mean of u = 100 and a standard deviation of U = 12, a. Find the zscore for each for the following x-values. x = 106 x = 91 x = 115 x = 130 x = 61 b. Find the score (xvalue) that corresponds to each of the following z-soores. z = -1.00 z = 0.75 = -.50 z = 1.50 z = 2.00 Z: 4.25 A population distribution with a mean of p = 58 and a standard deviation of o = 20 is transformed into a standardized distribution with p = 50 and o = 20. Find the new, standardized scores for each of the following values from the original population. x=46 x=76 x=40 x=80