00:01
Hello, let me start with part a.
00:09
And here the question is, what is the probability that at least one of the stocks will rise in price? in other words, what is the probability that at least one of events a or b happens? so this probability of a or b happening, this probability of a or b happening, is equal to 1 minus the probability that both events a or b will not happen.
01:08
I'm sorry about this.
01:12
A and b both will not happen.
01:19
And this is equal to 1 minus probability that the stock b will not rise is 1 minus 0 .53 or 0 .47 and we multiply this by the probability that stock a will not rise.
01:51
It's given that conditionally that if stock b doesn't rise in price, the probability that stock a will rise is 0 .47.
02:08
So we can calculate that the probability that stock a will not rise in price is 1 minus 0 .47 and it's 0 .53.
02:27
And now you can calculate.
02:29
The answer is 0 .75 if we round our answer to two decimal places.
02:48
So 0 .75 is a probability that at least one of the stocks will rise in price.
02:57
Now part b are events a and b mutually exclusive? so we know that in probability theory two events are mutually exclusive if they cannot occur at the same time together but in this case it's possible that they both can happen so our answer is no and we choose this answer option.
03:36
So they can occur at the same time...