STAT 205 Midterm: STAT 205 South Carolina Exam1 key
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Each lettered part of a problem is worth 7 points; there are 126 points total. However, your exam grade is out of 100 points, so there are 26 points of possible extra credit. Write clearly and show steps for partial credit. This exam is open book: the systolic blood pressure y of a random american adult follows a normal distribution with mean y = 127 mmhg and standard deviation y = 15 mmhg. Hypertension is de ned to be y > 140; hypotension (low blood pressure) is y < 90. (a) what is the probability of a randomly selected person having hypertension, p (y > P (y > 140) = p y 127. P (y < 90) = p y 127. P (90 < y < 140) = p 90 127. = p (z < 0. 87) p (z < 2. 45) Using the book"s table in reverse, we rst nd p (z < 1. 28) = 0. 8997.
