Explore BrainMass

Explore BrainMass

    Normal Probability

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

    Answer the questions about the specified normal distribution.

    a. The lifetime of ZZZ batteries are normally distributed with a mean of 265 hours and a standard deviation of 10 hours. Find the number of hours that represent the the 40th percentile.

    b. Scores on an English placement test are normally distributed with a mean of 36 and standard deviation of 6.5. Find the score that marks the top 5%.

    © BrainMass Inc. brainmass.com June 3, 2020, 11:05 pm ad1c9bdddf

    Solution Summary

    The solution provides step-by-step method for the calculation of probability based on Z score. Formula for the calculation and Interpretations of the results are also included.