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15. The tires manufactured by the ABC Tire Company last an average of 42,000 miles with...

15. The tires manufactured by the ABC Tire Company last an average of 42,000 miles with a standard deviation of 7800 miles. If a random sample of 100 the tires, manufactured by the ABC Tire Company is taken, what is the probability that these tires:

a) will last more than 41,000 miles?

b) will last less than 43,250 miles?

c) will last between 41,000 and 43,250 miles?

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