Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
math stats problem?
You have sent out 3500 invitations to hear a speaker and you must rent chairs for the people who come. In the past usually about 12% of the people invited have come to hear the speaker
(a) What is the approximate probability that more that 13% of 3500 invited will show up? How many chairs would you have to rent if exactly 13% of those invited attended
1 Answer
- alexLv 74 years agoFavorite Answer
Approximate to normal distrbution with mean = 12% , standard deviation = sqrt(12(100-12)) = 32.5%
Pr(x>13) = 0.4877 ~ 48.8%
13%of 3500 = 455 chairs
