Giving brainliest to first correct answer!! Two trapezoid-shaped tabletops are congruent to each other.

trapezoid FGHI = trapezoid WXYZ

Which side of trapezoid WXYZ must be congruent to GH?
A) XY
B) WX
C) YZ
D) WZ

A.XY is the correct answer of this exercise

(a)

(b) The best  point estimate of is the sample mean

The margin of error =  4.552

Step-by-step explanation:

Given : The confidence interval for the population mean =  (13.046 , 22.15)

Sample mean :

Standard deviation :

Sample size :

a. Let represents the population mean.

Then we can write the confidence interval for the population mean as :-

b. The best  point estimate of is the sample mean

Also, the lower limit of confidence interval can be written as

i.e.

Hence, the margin of error =  4.552