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OpenStudy (anonymous):
If 4 coins are tossed what is the probability of at least 2 heads
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OpenStudy (anonymous):
use binomial probability
OpenStudy (anonymous):
= 4C2(0.5)^4 + 4C3(0.5)^4 + 4C4 (0.5)^4
OpenStudy (amistre64):
or the complement; P0 and P1
OpenStudy (anonymous):
I would map out all the possibilities: HHHH HHHT HHTH HTHH THHH HHTT HTHT HTTH TTHH THTH THHT HTTT THTT TTHT TTTH TTTT
OpenStudy (anonymous):
Then you can count: 11/16
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