有两道数学题寻求大家帮助解答, 非常感谢!

Jasonleebj

(No.1) A home owner must pick between paint A, which costs $6.00 per liter, and paint B, which costs $4.50 per liter. Paint B takes one-third longer to apply than Paint A. If the home owner must pay the cost of labor at the rate of $36 per hour, which of the two paints will be cheaper to apply?
(1) the ratio of  the area covered by one liter of Paint A to the area covered by Paint B is 4:3;
(2) Paint A will require 40 liters of paint and 100 hours of labor.
Key: E

(No2) The arithmettic mean of a data set is 46 and the standard deviation of the set is 4. which value is exactly 1.5 standard deviations from the arithmetic mean of the set?
(A) 42; (B) 44.5; (C) 47.5; (D) 50; (E) 52.
Key: E