00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In the question here we're given the table of the probability for the x.
00:10
And the question asks you find the standard deviation.
00:14
To do it, i need to extend the column here.
00:22
And then the next column i want to compute it will be the x times probability of the x.
00:30
And then i need to multiply this value together.
00:33
So again the minus 0 .3.
00:36
Similarly, i got the 0 here, 0 .4, and this will be the 0 .75.
00:43
And then i compute the total here.
00:45
Then i get equal to the 0 .85...