Speeds of automobiles on a certain stretch of freeway at 11:00PM are normally distributed with mean 65 mph. Twenty percent of the cars are traveling at speeds between 55 and 65 mph. What percentage of the cars are going faster than 75 mph?
What will be an ideal response?
Since 20% of the cars are traveling between 55 and 65 mph, 30% are traveling less than 55 mph. The normal distribution is symmetric around the mean of 65. Therefore 30% of the cars are traveling faster than 75 mph.
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What will be an ideal response?
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A. parallel B. series