Explore BrainMass

Explore BrainMass

    Calculations based on Normal distribution

    Not what you're looking for? Search our solutions OR ask your own Custom question.

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

    1 The distribution of purchase amounts of customers of a popular retail store is normal with a mean of $25 and a standard deviation of $8.

    a. What percentage of customers spends less than $35?
    b. What percentage of customers spends between $15 and $35?
    c. Find the dollar amount such that 80% of customers spend at least this amount.

    3. The lifetime of Kenless washing machines is normally distributed with a mean of 4 years. Only 15% of these machines last at least 5 years. What is the standard deviation of the lifetime of a Kenless washing machine?

    4. Many drivers on US interstate highways do not observe the speed limit. Assume that the actual rates of speed driven in the US are normally distributed with a standard deviation of 5 miles per hour (mph).

    If 20% of all US drivers travel at 65 mph or more, what is the average?

    © BrainMass Inc. brainmass.com March 4, 2021, 7:43 pm ad1c9bdddf
    https://brainmass.com/statistics/normal-distribution/calculations-based-on-normal-distribution-119048

    Solution Summary

    Calculations based on Normal distribution such as probability in an interval.

    $2.49

    ADVERTISEMENT