Explore BrainMass
Share

Explore BrainMass

    Normal distribution probability calculations

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

    The manufacturer of an extended-life lightbulb claims the bulb has an average life of 12,000 hours, with a standard deviation of 500 hours. If the distribution is bell shaped and symmetrical, what is the approximate percentage of these bulbs that will last.
    a. between 11,000 and 13, 000 hours?
    b. Over 12,500 hours?
    c. Less than 11,000 hours?
    d. Between 11,500 and 13,000 hours?

    © BrainMass Inc. brainmass.com April 3, 2020, 6:20 pm ad1c9bdddf
    https://brainmass.com/statistics/normal-distribution/normal-distribution-probability-calculations-203972

    Solution Summary

    This solution is a set of examples of how to find normal distribution probabilities. Detailed hand calculations are provided.

    $2.19

    ADVERTISEMENT