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Historical Data shows that the diameter of current piston is a normally distributed random variable with...

Historical Data shows that the diameter of current piston is a normally distributed random variable with mean of 12 centimeters and a standar deviation of 0.06 centimeters.
1.if we use 46 ramdomly selected rings and calculate Xbar (average) , what is the probability of having and Xbar greater than 12.01 centimeters? Use original value of standard deviation.

2. Assume you take 40 rings and put them side by side in a line, what is the probability that the length of the line will exceed 490 centimeters? Use original value of standard deviation.

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orchestra answered 1 year ago
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