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Assume that a normal distribution of data has a mean of 13 and a standard deviation of 3. Use the 68-95-99.7 rule to find the percentage of values that lie below 19.

Answer :

Using the 68-95-99.7 rule for a normal distribution with a mean of 13 and standard deviation of 3, approximately 95% of the values will lie below 19. This is because 19 is two standard deviations above the mean.

To find the percentage of values that lie below 19 using a normal distribution with a mean of 13 and a standard deviation of three, we can apply the 68-95-99.7 rule (also known as the Empirical Rule). This rule is applicable to distributions that are bell-shaped and symmetric.

First, we calculate the number of standard deviations that 19 is from the mean:

Number of standard deviations = (Value - Mean) / Standard deviation
= (19 - 13) / 3
= 2 standard deviations

According to the rule, approximately 95% of data falls within two standard deviations of the mean. Therefore, since 19 is exactly two standard deviations above the mean, we would expect roughly 95% of the values to be below 19 because the distribution is symmetric about the mean.

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