00:01
For this problem, we're told that the manager of the local walmart superstore is studying the number of items purchased by customers in the evening hours.
00:07
And we're told that listed below is the number of items for a sample of 30 customers.
00:12
So i have just recreated the list here, but it's available in the textbook.
00:20
We're then in part a asked to find the mean and the median of the number of items.
00:28
So, one moment here.
00:30
To find the mean, let's see here, so this is going to be a sample.
00:37
So our mean value would be x bar, which equals the sum of the x values divided by the number of values, which in this case we'll find that the sum of the x values is going to be 273, and we are dividing that by 30 to get a mean value of about 9 .1.
00:57
Then for the median, we'll have to create a list of the data points in order.
01:06
One moment here, i'll expand this out so we can actually see them unfolded.
01:11
And since 30 is an even number, we would want to find essentially the middle two data points of the set and take the average of them, but the average of 9 and 9 is 9, so we find that the median is equal to 9...