SAT 数学题求翻译解答LAST WEEK‘S TOTAL HOURS WORKED AND HOURLY WAGES&

SAT 数学题求翻译解答

LAST WEEK‘S TOTAL HOURS WORKED AND HOURLY WAGES

FOR THE CASHIERS AT MARKET X

On Saturday of last week, Market X was open for 15 hours and exactly four cashiers worked. What was the greatest possible amount that the market could have paid in cashiers' wages for that day?

A 132 B 157.5 C 161.25 D 163 E 165

注：上周任何时候工作的出纳员的人数都不会超过2人，每个出纳员同一天工作都不超过12小时，且每天出纳员的工作都是持续不断的。
还有一道题：What is the probability that a mumber selected at random from the set of numbers above will be the average of the set?
A 0 B 1/10 C 1/5 D 3/10 E 2/5
这道题好像缺少条件，求这道题原题
第一题答案是C 第二题答案是D 求翻译解答