probability of being left handed

Statistics
Tutor: None Selected Time limit: 1 Day

 Write the word or phrase that best completes each statement or answers the question.
Use a graphing calculator to develop a simulation of the given problem (100 trials).  Describe the simulation, then estimate the probability based on its results.Assume that ten percent of us are left-handed.  The probability of getting at least two left-handed people in a group of 7.      
Jun 5th, 2015

Thank you for the opportunity to help you with your question!

the answer is as P(only one is right-handed)

P(x>=2)=1-(0.9)^7

=1-0.4782969

=0.5217

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 5th, 2015

is that the probability one person is right handed? I needed to know the probability 2 people out of 7 were left handed. Am I misunderstanding your work?

Jun 5th, 2015

using binomial process, nCx (P)^x (1-P)^(n-x); n=7 and P=0.9

for x=2, 0.00017+0.002551+0.02296+0.0124+0.372+0.4783= 0.8884

P(atleast two out of seven are left-handed)= 0.889

Jun 5th, 2015

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