00:01
Hello, so i'm going to ask you a question about how selling and the probability for doing so first i sketch the table here.
00:10
This is the table that is given in your problem and then i start calculating the issues the problem is that for calculate the variance and first need to calculate the mean i need to use this equation this equation you need to make the sumatory of all the probabilities times the specific amount of cases in your case houses solved so for example would be is 0 houses old times the probability 0 times 204, 0 .24 plus one household times the probability 0 .01 and so on 2 times 0 .12.
00:44
And then when you do all the additions of each expression, will give you 3 .6.
00:48
Then you need to calculate the variance.
00:51
For calculating the variance, you need to add all the expressions of all the x raised 2 square times the probability that is this part and then you subtract the mean also raised 2 square.
01:01
So in this case, for example, will be 0 raised 2 squares that would be the value for 0 houses times the probability, 1 household raised 2 square times the probability and so on, and then you subtract the mean that we calculate previously, this will give me the first part, 19 .34 and 3 .6, raised 2 the square is equal to 12 .96 and this would give me the variance...