SOLUTION: The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 1800 miles. What i
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Question 1160736: The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 1800 miles. What is the probability a certain tire of this brand will last between 56,220 miles and 56,760 miles?
0.4920
0.4649
0.9813
0.0180
You can put this solution on YOUR website! z=(x-mean)/sd
this is between -3780/1800 or -2.1
and -3240/1800 or -1.8
That probability of z between those two values is 0.01807
last choice Is the best.
