Posted by Laura on Monday, July 9, 2012 at 9:49pm.
You invent a new system to make excellent racing tires for the Indianapolis 500/ Your tires are good for an average of 105 miles, with a standard deviation of 7.5 miles. What is the probability that one of your tires can go for at least 44 laps? What is the probability that one of your tires will fail before the end of 36 laps?

Math  Probability  Reiny, Monday, July 9, 2012 at 10:37pm
How far is a lap?

Math  Probability  Lindsey, Monday, July 9, 2012 at 10:47pm
One lap is 2.5 miles.
Sorry, meant to include that before.

Math  Probability  Reiny, Monday, July 9, 2012 at 10:53pm
so 44 laps = 44(2.5) or 110 miles
36 laps = 90 miles
enter your values in
http://davidmlane.com/hyperstat/z_table.html
enter 110 for 44 laps in "above" > .2525
enter 90 and click on "below" > .02275
Answer This Question
Related Questions
 Math  You invent a new system to make excellent racing tires for the ...
 math  a tire manufacturer believes that the tread life of its tires are ...
 statistics  A maker of tires for cars has a multitude of data to support the ...
 Statistics  A purchasing agent for a trucking company is shopping for ...
 Statistics  A purchasing agent for a trucking company is shopping for ...
 mekele university  the lytton rubber company wishes set a minimum mileage ...
 STATS  The top selling Red and Voss tire is rated 70,000 miles means nothing. ...
 Math & Stats  Please help I was up till 2am trying to figure this out last ...
 mathstatistics  A manufacturer claims that the life span of its tires is 50,...
 Math  The speedometer of John's truck uses the revolutions of his tires to ...
More Related Questions