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.
00:05
Here we have the three questions and let me answer one by one for you.
00:10
For the number one, if we have the one to find if you have the human resource manager and you randomly select five jobs candidates to interview out of the hundred of the equally qualified candidate that apply for the job without replacement.
00:31
And then what would be the standard error of the mean if the standard tuition equals you the 1 and here we have the standard error the standard error of the mean the form equal to the sigma over the square root of the n here the standard division equal to the 1 and then the n here equal to 5 so therefore we divided by 5 and then we get equal to 1 divided by square root of of the 5 equal to the z -bond 4472 and that's will be the answer for the question 1.
01:18
Now for the question 2 we will have the us census bureau announced that the publication means sales equal to so we have the mean for the question 2 we have the mean equal to the 322100 and we have the standard division on the the price sigma equal to the 90 ,000.
01:42
And if you slender symbol size n equal to 100, and once you find the cumulative probability that the symbol mean could be less than the 346, once you find the probability that the summing xbound could be less than the 346 ,000.
02:04
Now to find this probability, i will convert this xx into the z, but i notice that it was the xxx, we minus the mean of the standard division, divided by square of n, we obtain the standard normal.
02:17
Therefore, i will turn the 346000 and minus the mean will be the 3221 .00 divided by the 90 ,000 or square rather the 100.
02:30
And if we compute, again, the probability the z smaller than.
02:34
Here we have the 346000, minus 322210.
02:41
And then divided by the 90 ,000 times when the 10, equal to the 2 .6, 6.
02:55
And to find this probability here, i need to bring up the z table...