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Three squares inches out of the total area under a frequency curve of 12 square inches falls below a score of 68. If the curve is based on a total of 80 cases, how many cases fall below a score of 68?
Statistics and Probability, Statistics
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A factory makes parts for laptop computers, including screws. The screws are required to have the right length. The lengths of the screws obey a normal distribution with mean μ=4.25 millimeters and standard deviation σ=0 ...
On average, the parts from a supplier have a mean of 97.5 inches and a standard deviation of 6.1 inches. Find the probability that a randomly selected part from this supplier will have a value between 85.3 and 109.7 inch ...
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If material hardness is normally distributed with a mean of 42 and a standard deviation of 1. Specification limits for hardness are from 35 to 45. When the fraction defective is 0.0017 what is the corresponding PPM?
50% of the cars in a dealer lot are red, 20% are black, and 16% are white. The remainder are some other unspecified color. Salespersons randomly shows three cars to three different customers. What is the probability the ...
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