A pharmaceutical company wishes to know whether an experimental drug being tested in its laboratories has any effect on systolic blood pressure. Fifteen randomly selected subjects were given the drug, and their systolic blood pressures (in millimeters) are recorded.

a. Guess the value of s using the range approximation.
b. Calculate and s for the 15 blood pressures.
c. Find two values, a and b, such that at least 75% of the measurements fall between a and b.

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