Question
The actual weights of bag of pet food are normally distributed.The mean of the weights is 50.0 lb,with a standard deviation of 0.2 lb.
A)About what percent of bags of pet food weigh less than 49.8 lb?
A)About what percent of bags of pet food weigh less than 49.8 lb?
Answers
z=(X-μ)/σ
=(49.8-50)/0.2
=-1
Look up the probability table normal distributions for z=-1, which should give around 16%.
=(49.8-50)/0.2
=-1
Look up the probability table normal distributions for z=-1, which should give around 16%.
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 170 and a variance of 4. The material is considered defective if the breaking strength is less than 166 pounds. What is the probability that a single, randomly selected piece of material will be defective?
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