he mean speed of a sample of vehicles along a stretch of highway is 67 miles per hour, with a standard deviation of 4 miles per hour. The number of vehicles in the sample is 75. Assume the data set has a bell-shaped distribution. (a) (/10 points) Estimate the percent of vehicles whose speeds are between 63 miles per hour and 71 miles per hour. (b) (/10 points) Estimate the number of vehicles whose speeds are between 63 miles per hour and 71 miles per hour. (c) (/10 points) In a sample of 25 additional vehicles, about how many vehicles would you expect to have speeds between 63 miles per hour and 71 miles per hour?
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'The mean speed of a sample of vehicles along a stretch of highway is 67 miles per hour; with a standard deviation of 4 miles per hour: Estimate the percent of vehicles whose speeds are between 63 miles per hour and 71 miles per hour: (Assume the data set has a bell-shaped distribution )'
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