If 30% of the people in a community use the library in one year, find these probabilities for a sample of 15?

people.





a. at most 7 used the library


b. exactly 7 used the library


c. at least 5 used the library

If 30% of the people in a community use the library in one year, find these probabilities for a sample of 15?
To ESTIMATE this answer, 30% is close to 1/3. One-third of 15 is 5.





OR to figure it out more exactly...





30% of 15 = ?


"of" means multiply.


30% X 15 = ?


30% = 30/100 or 3/10


15 = 15/1


3/10 X 15/1 = 45/10 = 4.5





The probability is that out of 15 people, in one year, 4 and a half people will use the library. I feel sorry for that .5 person! :D





Of the choices listed, C is the closest.
Reply:the best answer is c if 30=100; 15=x; 15multiple by100 divide by 30=50
Reply:d. None of the above.





30% of 15 = 4.5. So, statistically, less than 5 people use the library. You have no standard deviation specified, so you cannot make a statement of "at most" or "at least". And 4.5 is certainly not equal to 7.

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