The distribution of the length of bolts has a bell shape with a mean of 4 inches and a standard deviation of 0.007 inch. (a) About 68 % of bolts manufactured will be between what lengths? (b) What percentage of bolts will be between 3.986 inches and 4.014 inches? (c) If the company discards any bolts less than 3.986 inches or greater than 4.014 inches, what percentage of bolts manufactured will be discarded? (d) What percentage of bolts manufactured will be between 4.007 inches and 4.021 inches?
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The Normal Distribution Explained The normal distribution (bell curve) is one of the most important concepts in statistics. Key features: Symmetrical shape Mean = Median = Mode Most values lie near the average Used in: ✔ Research analysis ✔ Quality control ✔ Finance ✔ Social sciences Understanding normal distribution helps researchers make accurate conclusions | University Experts Academy -UEA.
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