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 of the company's annual expense with the service contract for the presentation equipment is ________________________ .

A) $105
B) $10.25
C) $187.42
D) $13.69
E) $2.75