For the medical study, a researcher wishes to select people in the middle of 40% of the population based on blood pressure. If the mean systolic blood pressure is 120 and the standard deviation is 8, Find the upper and lower reading that would qualify people to participate in the study.       a.114.7 < x < 125.2                                      c.  115.7 < x < 124.7       B.114.9 < x < 125.8                                      d. 115.8 < x < 124.2

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