Business, 04.02.2020 19:47 nook4boo

Acompany is considering implementing one of two quality control plans for monitoring the weights of automobile batteries that it manufactures. if the manufacturing process is working properly, the battery weights are approximately normally distributed with a specified mean and standard deviation.

quality control plan a calls for rejecting a battery as defective if its weight falls more than 2 standard deviations below the specified mean.

quality control plan b calls for rejecting a battery as defective if its weight falls more than 1.5 interquartile ranges below the lower quartile of the specified population.

assume the manufacturing process is under control.
a) what proportion of batteries will be rejected by plan a?
b) what is the probability that at least 1 of 2 randomly selected batteries will be rejected by plan a?
c) what proportion of batteries will be rejected by plan b?

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using the plan A, we reject 2 batteries every 100 bateries produced
so 2 out of every 100 batteries are rejected for A

c) we have to look at row with z=-1.5, and we have to pick the number at the first column, similarly for question a)

7 batteries out for every 100 batteries are rejected for plan B.

Answer from: Quest

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explanation:

Answer from: Quest

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Acompany is considering implementing one of two quality control plans for monitoring the weights of...

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