STATS

The top selling Red and Voss tire is rated 70,000 miles means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles and a standard deviation of 6,400.

a. What is the probability that a tire wears out before 70,000 miles.

b. What is the probability that a tire last more than 100,000 miles?

asked by SANDRA
  1. Please use the same name for your posts. Karen, Sandra, Joi.

    posted by Ms. Sue
  2. .6

    posted by andrew
  3. X~N(82000,6400^2)
    a) P(X<70000)=P((X-82000)/6400<(70000-82000¡­ Z-table=0.0303964
    P(X<70000)=0.0303964

    b) P(X>100000)=P(Z>2.8125)=0.0024579

    posted by Mariam Anwar

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