Using the empirical rule, determine the approximate percentage of a normal distribution that is expected to fall

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Using the empirical rule, determine the approximate percentage of a normal distribution that is expected to fall within the interval described.

a. Less than the mean

b. Greater than 1 standard deviation above the mean

c. Less than 1 standard deviation above the mean

d. Between 1 standard deviation below the mean and 2 standard deviations above the mean

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