- Joined
- May 18, 2008
- Messages
- 318
- Reaction score
- 0
im sure its not an error but it seems like it
the question is the weatherman tells u that there is a 70% chance of rain each day for the next 3 days. Whst is the probability it will 2 out of the 3 days.
The formula to use is nCr p^n(1-p)^r
-where p=the probabilty of an event occuring
-n=total number of trials
-r=number of trials having the desired results
destroyer did (3!/(2!1!)(7/10)^2 (.3)^1
the part in the red is what i dont agree with there were 3 total trials so shuldnt n=3 and the desired we wanted 2 rainy days so shouldnt r=1
the question is the weatherman tells u that there is a 70% chance of rain each day for the next 3 days. Whst is the probability it will 2 out of the 3 days.
The formula to use is nCr p^n(1-p)^r
-where p=the probabilty of an event occuring
-n=total number of trials
-r=number of trials having the desired results
destroyer did (3!/(2!1!)(7/10)^2 (.3)^1
the part in the red is what i dont agree with there were 3 total trials so shuldnt n=3 and the desired we wanted 2 rainy days so shouldnt r=1