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Problem form Tolerance intervals For the lead concentration of an area, a normal distribution with 300...

Problem form Tolerance intervals

For the lead concentration of an area, a normal distribution with 300 ppm and
standard deviation = 50ppm provided.

1 What is the probability that samples have a lead content of 200 ppm
exceed?
2 What percentage of the samples are in the range of 350 - 380 ppm?
3 What is the maximum lead content in 80% of the samples?
Make sketches (normal distribution) for all 3 tasks.
Give the solution.

Math   Statistics-And-Probability   
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