Flip a coin pt. 1 (Simple)
Probability
Level
2
Jamie has two coins, one being bias and the other not. The bias one is to land on heads 30% of the time and tails 70%, while the non-bias is 50/50. If I was to flip each coin 10 times, find the expected number of heads obtained.
The answer is 8.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
The bias one would land 3/10 x 10. That is 3. Then, the non-bias one would land on heads 5 times as it is a fair coin. 5+3 = 8