SOLUTION: a rupee coin is tossed 10 times what is the probability that head will appear exactly 7times.

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Question 619164: a rupee coin is tossed 10 times what is the probability that head will appear exactly 7times.
Answer by Edwin McCravy(20067) About Me  (Show Source):
You can put this solution on YOUR website!

%22C%2810%2C7%29%22%281%2F2%29%5E7%281-1%2F2%29%5E%2810-7%29 =

%2810%21%2F%287%21%29%2810-7%29%21%29%281%2F2%29%5E7%281%2F2%29%5E3 =







The 3 in the bottom cancels into the 9 on top giving 3:

   3
%28%2810%2Across%289%29%2A8%29%2F%28cross%283%29%2A2%2A1%29%29%281%2F2%5E10%29


The 2 cancels into the 8 on top giving 4

   34


That becomes%2810%2A3%2A4%29%2F%282%5E10%29

or

120%2F2%5E10 

or

120%2F1024%7D%0D%0A%0D%0Aor+%7B%7B%7B15%2F128

or

.1171875

which you can get on a TI-84 by using 10 trials with p=.5 and
x value 7.  Then Paste and you have:

binompdf(10,.5,7
(

Press ENTER and you get the above value.


Edwin