# Stat Novice Needs Help With Probability Problem!

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• Feb 24th 2013, 06:11 PM
NoviceStats
Stat Novice Needs Help With Probability Problem!
Hi Everyone!

I'm so happy to have found this forum. I am the absolute worst at math, and I'm almost positive I'm doing this problem wrong. I would be extremely helpful for any help!

1. The following table shows the number of patients with different types of disorders / disease associated with patients at General Hospital within the last year. Assume each patient has only one disorder

 Types of Disorders / Disease Number of Patients with Disorder / Disease Liver Disease 346 Lung Cancer 147 Heart Disease 232 Diabetes 187 Alzheimer’s 93

1. Find the probability that a random person selected has liver disease
2. Find the probability that a random person selected has lung cancer or liver disease or heart disease
3. Find the probability that a random person selected has liver disease and lung cancer

d. What type of probability calculation approach is being exercised in this example (classical, relative frequency or subjective)?

My answers:
a. 346/1005 = .34
b. (147+346+232)/1005 = .72
c. Not really sure what my professor is asking here. The question says to assume each person has only one disorder.
d. Classical

Thanks again for your time everybody!
• Feb 24th 2013, 06:18 PM
chiro
Re: Stat Novice Needs Help With Probability Problem!
Hey NoviceStats.

Hint: If one person can only have one disease then the probability of having two should be 0.
• Feb 24th 2013, 06:26 PM
NoviceStats
Re: Stat Novice Needs Help With Probability Problem!
@Chiro:

Haha I assumed that, but I did not know if maybe it was a trick question or something. Thank you!