Sharon's phone is calling for donations of used clothing and household items to charities. She knows from her experience that about 30% of her phone calls come from donations. How many times does she need to call to make sure she receives at least two donations 90%?
Sharon's phone is calling for donations of used clothing and household items to charities. She knows from her experience that about 30% of her phone calls come from donations. How many times does she need to call to make sure she receives at least two donations 90%?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Transcribed Image Text:Sharon's phone is calling for donations
of used clothing and household
items to charities. She knows from
her experience that about 30% of her
phone calls come from donations. How
many times does she need to call to
make sure she receives at least two
donations 90%?
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