A Manufacturer Receives a Shipment of 170 Laptop Computers of Which

Multiple Choice

A manufacturer receives a shipment of 170 laptop computers of which 9 are defective. To test the shipment, thequality control engineer randomly selects 10 computers from the shipment and tests them. The randomvariable X represents the number of defective computers in the sample. What are the mean and standarddeviation of the random variable X?

A) $\mu \chi = 0.529 , \sigma \chi = 0.689$
B) $\mu _ { X } = 0.529 , \sigma X = 0.708$
C) $\mu _ { X } = 0.053 , \sigma _ { X } = 0.689$
D) $\mu _ { X } = 0.529 , \sigma X = 0.475$