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OpenStudy (anonymous):
A coin is tossed 11 times. What is the probability of obtaining exactly 9 heads? A. 0.0269 B. 0.0054 C. 0.1611 D. 0.0806
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OpenStudy (kc_kennylau):
\[\Large P=\left(\begin{array}{c}11\\9\end{array}\right)\times\left(\frac12\right)^{11}\]
OpenStudy (anonymous):
0.0054 (B)
OpenStudy (kc_kennylau):
This is not what I have calculated
OpenStudy (anonymous):
Before i got A(0.0269), could that be correct?
OpenStudy (phi):
11C9 = 55 ½^11 is 1/2048
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OpenStudy (anonymous):
?
OpenStudy (kc_kennylau):
Yep I got A
OpenStudy (anonymous):
thank you!
OpenStudy (kc_kennylau):
no problem
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