Need help with probability question
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Need help with probability question

[From: ] [author: ] [Date: 13-10-23] [Hit: ]
(2/5)^10 is the same as (2/5)(2/5)(2/5)... 10 times and you get the answer .I just did this problem just now :P you in biostats too?!......
the book gave me the answer but i have no idea how to obtain that answer. heres the problem:

RH type Groups
O A B AB

Positive 39 35 8 4

negative 6 5 2 1

The given data suggests that 40% of the population consists of people with group A blood. If 10 people are randomly selected from the general population (instead of the sample of 100 people in the given table), find the probability that they all have group A blood.

Like what is the general population first of all? Anyways, the book gave me the answer: 0.000105

Thanks for your time

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40% is 2/5 and you're finding 10 people with group A blood. Disregard the chart since its asking for the general population.

(2/5)^10 is the same as (2/5)(2/5)(2/5)... 10 times and you get the answer .000105

I just did this problem just now :P you in biostats too?! haha
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