The Owner of Touchdown Sports Bar Wants to Develop a Time

Multiple Choice

The owner of Touchdown Sports Bar wants to develop a time standard for the task of mixing a specialty cocktail. In a preliminary study, he observed one of his bartenders perform this task seven times with an average of 90 seconds and a standard deviation of five seconds.
What is the normal time for this task if the bartender worked at a 20 percent faster pace than is average?

A)  75 seconds
B)  90 seconds
C)  108 seconds
D)  110 seconds
E)  112.5 seconds