Probability that a person's birthdate is in the given range

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SUMMARY

The probability of a person's birthday falling between January 20th and January 29th is calculated by dividing the number of favorable outcomes by the total number of outcomes in January. The total number of days in January is 31, while the favorable outcomes for the specified range are 10 (from the 20th to the 29th inclusive). Therefore, the probability is 10/31, making option A the correct answer. This analysis emphasizes the importance of clearly defining the problem and showing work to facilitate better guidance in mathematical discussions.

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If a person's birthday is in January, what are the odds that it is between the 20th and the 29th, inconclusively?
A. 10/31
B. 8/21
C. 21/31
H. 10/21

Thanks(Sun)
 
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Hello and welcome to MHB! :D

First, I want to point out a couple of issues...I moved your thread from the Chat Room to our Basic Probability forum as this is a better fit for your question. The Chat Room is for informal discussions about pretty much anything, and we ask that actual math problems be posted in the appropriate forum so that MHB is more useful for everyone.

Your original thread title did not indicate anything about the nature of your question. Again, doing so makes MHB more useful for everyone.

Lastly, we do ask that you show what you tried so that we can see where you are stuck and/or where you may be going wrong, and then we can offer guidance to get you unstuck.

Okay, now let's look at the problem. We know that the probability will be the number of favorable outcomes divided by the total number of outcomes.

Favorable outcomes: How many ways can a person's birthday be in the given rage?

Total outcomes: How many ways can a person have a birthday in January?
 

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