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According to AAA the average age of cars and light trucks in the U.S is 10.8 years. Assume that the standard deviation for this population

According to AAA the average age of cars and light trucks in the U.S is 10.8 years. Assume that the standard deviation for this population is 4.2 years. A sample of 35 randomly selected vehicles was selected. What is the probability that the sample mean will be less than 11.5 years? 0.9846,0.8379,0.0353,0.8996

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