Question

question
for males in a certain town, the systolic blood pressure is normally distributed with a mean of 120 and a standard deviation of 9. using the empirical rule, determine the interval of systolic blood pressures that represent the middle 68% of males.
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attempt 1 out of 2
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Explanation:

Step1: Recall Empirical Rule for 68%

For normal distribution, 68% of data lies within $\mu \pm \sigma$. Here, $\mu = 120$, $\sigma = 9$.

Step2: Calculate Lower Bound

Lower bound = $\mu - \sigma = 120 - 9 = 111$.

Step3: Calculate Upper Bound

Upper bound = $\mu + \sigma = 120 + 9 = 129$.

Answer:

(111, 129)