A factory manufactures bottles at a cost of C(x) = 20 + 3x dollars per bottle when x bottles are produced per day. What is the difference in the daily cost (C) of manufacturing if instead of 35 bottles, 50 bottles are produced each day? A.
$ 2212.50
B.
$ 1912.00
C.
$ 345.00
D.
$ 45.00

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%