Posted by SANDRA on Friday, September 16, 2011 at 11:09pm.
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?

STATS  Identity crisis  Ms. Sue, Friday, September 16, 2011 at 11:12pm
Please use the same name for your posts. Karen, Sandra, Joi.

STATS  andrew, Tuesday, July 10, 2012 at 10:55pm
.6

STATS  Mariam Anwar, Sunday, March 31, 2013 at 3:05am
X~N(82000,6400^2)
a) P(X<70000)=P((X82000)/6400<(7000082000¡ Ztable=0.0303964
P(X<70000)=0.0303964
b) P(X>100000)=P(Z>2.8125)=0.0024579
Answer This Question
Related Questions
 Math & Stats  Please help I was up till 2am trying to figure this out last ...
 math  a tire manufacturer believes that the tread life of its tires are ...
 statistic  one of the major U.S. tire makers wishes to review its warranty for ...
 statistics  one of the major U.S. tire makers wishes to review its warranty for...
 math  The tread life of a particular tire is a random variable best described ...
 stats  The life of tires manufactured by Omega Tires Inc is believed to be ...
 statistics  The tread life a certain brand of tires is known to be normally ...
 statistics  The tread life a certain brand of tires is known to be normally ...
 Statistics  According to internal testing done by the GetAGrip tire company, ...
 Behavioral Statistics  I need someone to explain HOW to do this..I don't want ...
More Related Questions