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If we start out with this formula: z=(X-µ)/σ and we know that the mean and standard deviation we are working with are 1123 and 214, respectively, the formula becomes:

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So for a percent-less-than question, one would standardize and then look up in a normal curve left-area table (or else use technology). For the question here, the standard score for the cut is

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They found the set of data to be normally distributed with a mean speed of 36 km/h and a standard deviation of 2 km/h. What percentage of the vehicles passed on Union