The tread lives of the Super Titan radial tires under normal driving conditions are normally distributed with a mean of 60,000 mi and a standard deviation of 4,000 mi.
If four new tires are installed in a car and they experience even wear, determine the probability that all four tires still have useful tread lives after 55,200 mi of driving.

Question

The tread lives of the Super Titan radial tires under normal driving conditions are normally distributed with a mean of 60,000 mi and a standard deviation of 4,000 mi. ​
If four new tires are installed in a car and they experience even wear, determine the probability that all four tires still have useful tread lives after 55,200 mi of driving.
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Quizplus · Accepted Answer

The Answer of The tread lives of the Super Titan radial tires under normal driving conditions are normally distributed with a mean of 60,000 mi and a standard deviation of 4,000 mi. ​
If four new tires are installed in a car and they experience even wear, determine the probability that all four tires still have useful tread lives after 55,200 mi of driving.
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The Tread Lives of the Super Titan Radial Tires Under