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 are going to discuss about the normal distribution.
00:11
Let me remind you that if the x that follow by the normal with the mean and the standard deviation, and if we take the x minus the mean of a standard deviation, we obtain the standard normal.
00:23
In the question here, we are given the weight x will follow by the normal with the mean equal to the 333.
00:32
And the standard deviation, it will equal to the 230.
00:38
And the question 7 asks, need to find the probability that the weight it will be more than the 3 ,100.
00:45
To find this value here, we will need to convert the x into the z by using this formula.
00:52
So i will have the z greater than 3 ,100 minus the mean 3 ,500 over the 2 ,000 ,000.
01:01
So it will compute when the z greater than the 400 divided by the 230.
01:10
It will be minus 1 .74.
01:15
Now to find this probability i need to bring up the z table.
01:19
So let me combine the z table and put the table on the right here.
01:25
Now notice then the table i bring here, it has the negative g score with the probability on the left tail.
01:31
Right now it's not compatible with this one yet.
01:33
Because it's on the right.
01:35
Now it will try to draw the graph on the standard normal.
01:40
And then the 0 will be here.
01:42
Now suppose this value will be the minus 1 .74 and the probability will look for equal to the area on the right here.
01:51
Now if you find this area, which is the total area, will be 1...