PRODUCT RELIABILITY THE TREAD LIVES OF THE SUPERTITAN TIRES UNDER NORMAL DRIVING CONDITIONS ARE NORMALLY...

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PRODUCT RELIABILITY THE TREAD LIVES OF THE SUPERTITAN TIRES UNDER NORMAL DRIVING CONDITIONS ARE NORMALLY DISTRIBUTED WITH A MEAN OF 40 000 MILES AND A STANDARD DEVIATION OF 2000 MILES a b WHAT IS THE PROBABILITY THAT A TIRE SELECTED AT RANDOM WILL HAVE A TREAD LIFE OF MORE THAN 35 000 MILES 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 35 000 MILES OF DRIVING

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