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# A doctor is concerned about the relationship between blood

ISBN: 9780321923271 41

## Solution for problem 3E Chapter 1.5

Probability and Statistical Inference | 9th Edition

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Problem 3E

PROBLEM 3E

A doctor is concerned about the relationship between blood pressure and irregular heartbeats. Among her patients, she classifies blood pressures as high, normal, or low and heartbeats as regular or irregular and finds that (a) 16% have high blood pressure; (b) 19% have low blood pressure; (c) 17% have an irregular heartbeat; (d) of those with an irregular heartbeat, 35% have high blood pressure; and (e) of those with normal blood pressure, 11% have an irregular heartbeat.What percentage of her patients have a regular heartbeat and low blood pressure?

Step-by-Step Solution:

Step 1 of 3:

An experiment is conducted to find the relationship between blood pressure and irregular heart beats.  Among the patients the doctor classifies blood pressure as high, normal or low and heartbeats as regular and irregular. In that

16% have high blood pressure.19% have low blood pressure.17% have an irregular heartbeat.Of those who have irregular heartbeat , 35% have high blood pressure. Of those having normal pressure, 11% have an irregular heartbeat.

We have to find what percentage patients have a regular heartbeat and low blood pressure.

Step 2 of 3:

Let define the events

A={ patient have high blood pressure }

B= { patients have low blood pressure}

C = { patients have normal pressure}

R = { patients have regular heartbeat}

I =  { patients have irregular heartbeat}

It is given that

P(A) = 0.16

P(B) = 0.19

P(I)  = 0.17

P(I = 0.35 * 0.17

= 0.0595

P(C =   0.11* P(C)

Where

P(C) = 1-0.19-0.16 = 0.65

P(C =  0.65* 0.11

= 0.0715

Step 3 of 3

##### ISBN: 9780321923271

This textbook survival guide was created for the textbook: Probability and Statistical Inference , edition: 9. Probability and Statistical Inference was written by and is associated to the ISBN: 9780321923271. The full step-by-step solution to problem: 3E from chapter: 1.5 was answered by , our top Statistics solution expert on 07/05/17, 04:50AM. This full solution covers the following key subjects: Blood, pressure, irregular, heartbeat, high. This expansive textbook survival guide covers 59 chapters, and 1476 solutions. The answer to “A doctor is concerned about the relationship between blood pressure and irregular heartbeats. Among her patients, she classifies blood pressures as high, normal, or low and heartbeats as regular or irregular and finds that (a) 16% have high blood pressure; (b) 19% have low blood pressure; (c) 17% have an irregular heartbeat; (d) of those with an irregular heartbeat, 35% have high blood pressure; and (e) of those with normal blood pressure, 11% have an irregular heartbeat.What percentage of her patients have a regular heartbeat and low blood pressure?” is broken down into a number of easy to follow steps, and 89 words. Since the solution to 3E from 1.5 chapter was answered, more than 323 students have viewed the full step-by-step answer.

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