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n Boeing aerospace industry, a study was conducted on the weights of a specific jet engine...

n Boeing aerospace industry, a study was conducted on the weights of a specific jet engine spare part , in grams, which follows normal distribution. A random sample of 13 spare parts is selected and has a mean weight of 62.8 grams and variance of 25.06 grams.

The lower 90% tolerance limit on the weights of the spare parts that contains 95% of the distribution, is closest to:

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The lower 90% tolerance limit is 56.34 grams.

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