00:01
For this question, we have a disagree random variable, x, which has six possible values, 0, 1, 2, 3, 4, and 5.
00:12
We have the corresponding probabilities .04, 0 .33, 0 .27 .21, 0 .13 .12 .12.
00:25
So we have the probability mass function here.
00:28
And then we want to calculate the main and stand deviation.
00:33
So the main x bar is equal to just the average value of this sum from 1 to 6 because we have six values.
00:42
So the i's value is xy and the i's probability is pi.
00:47
So we just have these pairs.
00:49
The product of these two, product this two and et cetera.
00:53
So we sum up these products and then we divide by six, we will have the main.
00:58
Which is 2 .12.
01:01
Stan deviation, we can use the formula that, which is equal to root of 1 over 6 times xx minus 1 times the root of x i minus x bar square for i from 1 to 6.
01:22
So we have these xy and we have got the average value here.
01:26
So we calculate the difference and then square...