Yeti
01-16-2005, 12:28 PM
Wouldn't mind a little help with this one. Got a test tomorrow and I don't really know how to do questions of this ilk. I have past papers but no answers /images/graemlins/frown.gif
Here it is :
The probability of obtaining a head when a certain coin is tossed is 0.4. The coin is tossed 10 times.
Find the probability that there are exactly 3 heads and the third head occurs on the tenth toss.
I can do the exactly 3 heads part, just not sure how to take into account the last coin being a head? Thanks.
Here it is :
The probability of obtaining a head when a certain coin is tossed is 0.4. The coin is tossed 10 times.
Find the probability that there are exactly 3 heads and the third head occurs on the tenth toss.
I can do the exactly 3 heads part, just not sure how to take into account the last coin being a head? Thanks.