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OpenStudy (anonymous):
You flip 3 coins. Use a tree diagram to calculate the probability that you get exactly 2 heads.
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OpenStudy (amistre64):
might as well flip one coin 3 times
OpenStudy (amistre64):
C(3,2) * .5^3
OpenStudy (amistre64):
or simply 3 * .125
OpenStudy (amistre64):
.5 .5 ---- .25 .5 ---- .125 ... yeah thats the one
OpenStudy (amistre64):
.125 3 ----- .375
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OpenStudy (amistre64):
which is, by the way, 3/8
OpenStudy (anonymous):
so wats that in a fraction
OpenStudy (amistre64):
|dw:1316115540154:dw|
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