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What percentage of bolts will have a diameter

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1) The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?

2) The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches. What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?  

3) A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following

a. What scores fall between -1 and +1 standard deviation?

b. What percent of all scores fall between -1 and +1 standard deviation?

c. What score falls at +2 standard deviations?

d. What percentage of scores falls between +1 and +2 standard deviations?

Reference no: EM131932609

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