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 99.7 of males.

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sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.

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