Find the sample standard deviation and the population standard deviation of the data set. 68, 56, 43, 60, 70, 75, 72, 45, 54, 51, 59, 45, 47, 82, 46

47 - 90 = 43

43 - 180 = x

x = 137

answer: the resulting cross section is a rectangle. solution: a plane parallel to the base of a triangular prism will intersect a cross section that is the same shape as its bases. so the cross section is a triangle.

step-by-step explanation:

the answer is 21%.

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5