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    Probability using standard normal distribution

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    1. The mean amount of gasoline and services charged by Key Refining Company credit customers is $70 per month. The distribution of amounts spent is approximately normal with a standard deviation of $10. What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83?
    A) 0.1962
    B) 0.4032
    C) 0.3413
    D) 0.4750

    2. The upper and lower limits of a uniform probability distribution are:
    positive and negative infinity.
    plus and minus three standard deviations.
    0 and 1.
    the maximum and minimum values of the random variable.

    11. The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation 50. What is the area under the normal curve between 400 and 482?
    A) 0.5000
    B) 0.4495
    C) 0.3413
    D) 0.4750

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    Solution Summary

    This solution is comprised of a detailed explanation of standard normal distribution or z score. In this solution, step-by-step explanation of this complicated topic provides students with a clear perspective of standard normal distribution to find the probability.