A factory produced toy cars at a rate of 400 cars per hour. If 12 cars are defective each hour, what percent of the toys are defective?

3% are defective

Step-by-step explanation:

400 cars are 100%

12 cars are x %

so x=12*100/400= 12/4=3 %

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0