Explore BrainMass

Explore BrainMass

    Reliability using normal distribution

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Assume you tested svereral Firestone tires and recorded their failure times (as defined by an engineer).After doing a Chi-Square test ,you decided taht failures are normally distributed ,with mean failure of 50,000 miles and a standard deviation of 10,000 miles .Determine the following:

    a) reliability of the tires at 40,000 miles
    b) given that a tire has been driven (on a test machine) 20,000 miles, determine its reliability at 60,000 miles.

    © BrainMass Inc. brainmass.com May 20, 2020, 1:59 pm ad1c9bdddf

    Solution Preview

    Mean=M = 50,000 miles

    Standard deviation =s= 10,000 miles

    x= 40,000 miles

    z=(x-M )/s= -1 =(40000-50000)/10000

    Cumulative Probability corresponding to z= -1 is= 0.1587

    Or Probability corresponding to x< 40,000 is ...

    Solution Summary

    Reliability has been calculated using normal distribution.