Question 190443: In this question, answer to at least 3 decimal places accuracy.
Data shows that 86% of all people are right handed. In a group of 10 people,
what would be the expected value for the number of right handed people in the group? 8.6
What is the probability that exactly 8 of the people in the group are right handed?
What is the probability that at least 8 of the people in the group are right handed?
thanks bunches
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! In this question, answer to at least 3 decimal places accuracy.
Data shows that 86% of all people are right handed.
In a group of 10 people, what would be the expected value for the number of right handed people in the group? 8.6
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What is the probability that exactly 8 of the people in the group are right handed?
n=10 ; p = 0.86 ; x = 8
P(x=8) = 10C8*(0.86)^8*(0.14)^2 = 45*0.29922*0.1960 = 0.2639
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What is the probability that at least 8 of the people in the group are right handed?
P(x = 8,or 9,or,10)
= 0.2639 + 10C9(0.86)^9(0.14)^1 + (0.86)^10
= 0.84547..
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Cheers,
Stan H.
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