00:01
In this question, we're given that the number of accidents occurring on the first highway, i let that be x1.
00:09
I let that be x1, and it follows a poison distribution with the mean 0 .2.
00:18
For the second highway, the number of accidents occurring, i call that x2.
00:24
X2 will follow a poison distribution of the mean is 0 .3.
00:30
And x3 is the number of accidents occurring on the third highway in the day and x3 we know it follows a poison distribution of 0 .5 so i'm going to let x be x1 plus x2 plus x3 now addition of poison distribution will still follow a poison distribution so x will follow a poison distribution with the means added together so x follows a poison distribution of 1.
01:06
Probability of x equals to r is 1 to the power of r over r factorial e to power minus 1.
01:16
So this is just 1 over e r factorial.
01:21
So in part a, we want to find probability zero accidents will happen in any of this highway.
01:28
So we're looking at probability x equals to 0...