What is the first error he made in computing the standard deviation?

a. yuri failed to find the difference between each data point and the mean.

b. yuri divided by n instead of n -1.

c. yuri did not subtract 9 - 14 correctly.

d. yuri failed to square -2 correctly.

Me! i'm really confused the isosceles trapezoids, abcd and efgh, are similar quadrilaterals. the scale factor between the trapezoids is 2: 3, line gh = 6 centimeters, line ad = 8 centimeters, and line ab is three times the length of line dc . use complete sentences to answer the following prompts and include all of your calculations in your final answer. a. write a similarity statement for each of the four pair of corresponding sides. b. write a congruence statement for each of the four pair of corresponding angles. c. determine the perimeter for each of the isosceles trapezoids.