A Small Business Just Leased a New Presentation Equipment and a Color

Multiple Choice

A small business just leased a new presentation equipment and a color laser printer for three years.The service contract for the computer offers unlimited repairs for a fee of $100 a year plus a $25 service charge for each repair needed.The company's research indicates that during a given year 86% of these computers need no repairs, 9% need to be repaired once, 4% twice, 1% three times, and none required more than three repairs.
The standard deviation in the number of repairs for this kind of computer per year is ________________________ .

A) 0.20 repairs
B) 0.55 repairs
C) 0.89 repairs
D) 1.00 repairs
E) 1.20 repairs