If there are 21 values in a data set in order from smallest to largest, what is the third quartile of the data set?
A. The mean of the 19th and 20th values
B. The mean of the 18th and 19th values
C. The mean of the 17th and 18th values
D. The mean of the 16th and 17th values

C

Step-by-step explanation:

Hope this helps u

363 square inches

step-by-step explanation:

surface area of a pyramid is b + 1/2ph

b is the area of the base: 11 x 11 = 121

p is the perimeter of the base: 11 + 11 + 11 + 11 = 44

h is the height of the pyramid: 11

121 + 1/2(44)(11)

121 + 242

363