According to the empirical rule, approximately what percentage of the area under a normal distribution lies within

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2.  According to the empirical rule, approximately what percentage of the area under a normal distribution lies within 1 standard deviation of the mean? Within 2 standard deviations?Within 3 standard deviations?

4.  Can a normal distribution always be used to approximate a binomial distribution?

10.  If x has a normal distribution with mean µ = 15 and standard deviation ó = 3, describe the distribution of ­­­x values for sample size n, where n = 4, n = 16, and n = 100.  How do the x distributions compare for the various sample sizes?

12.  Given that x is a normal variable with mean µ = 110 and standard deviation ó = 12, find:

                a) P(x≤120)                       b) P(x≥80)                     c) P(108≤ x ≤ 117)

 

    • 9 years ago
    According to the empirical rule, approximately what percentage of the area under a normal distribution lies within
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