SOLUTION: Of the 538 people who had an annual check-up at a doctor’s office, 215 had high blood pressure. Estimate the probability that the next person who has a check-up will have high bl

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Question 1161881: Of the 538 people who had an annual check-up at a doctor’s office, 215 had high blood pressure. Estimate the probability that the next person who has a check-up will have high blood pressure.
Find the probability of correctly answering the first 4 questions on a multiple choice test using random guessing. Each question has 3 possible answers.

Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
.

You can estimate this probability  EMPIRICALLY as   P = 215%2F538 = 0.399 ~ 0.4,

without having serious basis for it.

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For the other problem,  there are   3%5E4 = 81  possible outcomes / (answers).

The probability to guess randomly any one specific combination  ("the correct answer")  is   1%2F81.

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To learn on typical probability problems of an introductory level,  look into the lessons
    - Simple and simplest probability problems
    - Solving probability problems using complementary probability
    - Elementary Probability problems related to combinations
    - A True/False test
    - A multiple choice answers test
    - Conditional probability problems
    - Typical probability problems from the archive
    - Experimental probability problems
    - Elementary operations on sets help solving Probability problems
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Solved problems on Probability".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.

Consider these lessons as your textbook,  handbook,  a Solutions Manual,  tutorials and  (free of charge)  home teacher.


Happy learning (!)