In order to answer this question correctly, we need to recall the definition of mean:

Mean: The mean of a data set is the average of the numbers in a data set. 

In order to calculate the mean we must first add up all of the numbers in the data set:

Next, we need to divide by the number of addends, or the number of numbers in the data set:

The mean for this data set is 

In order to answer this question correctly, we need to recall the definition of mean:

Mean: The mean of a data set is the average of the numbers in a data set. 

In order to calculate the mean we must first add up all of the numbers in the data set:

Next, we need to divide by the number of addends, or the number of numbers in the data set:

The mean, rounded to the nearest hundredth, for this data set is 

In order to answer this question correctly, we need to recall the definition of mean:

Mean: The mean of a data set is the average of the numbers in a data set. 

In order to calculate the mean we must first add up all of the numbers in the data set:

Next, we need to divide by the number of addends, or the number of numbers in the data set:

The mean, rounded to the nearest hundredth, for this data set is 

In order to answer this question correctly, we need to recall the definition of mean:

Mean: The mean of a data set is the average of the numbers in a data set. 

In order to calculate the mean we must first add up all of the numbers in the data set:

Next, we need to divide by the number of addends, or the number of numbers in the data set:

The mean for this data set is 

In order to find the median, we must first put the data in numerical order from least to greatest:

Next, we must find the number that is in the middle, but since there are fourteen numbers, there is no number that falls exactly in the center.  When this happens, we add the two middle numbers together and divide by two.  In this case, our middle numbers are and .

Brandon's median distance is .

Each data set has five elements; the median is the element in the middle after the elements are arranged in ascending sequence, which both are. In each case, the median will be the third-highest element. Since in both data sets, this element is 100, the medians are equal.

The median of a data set with an even number of elements is the mean of the two elements in the middle when they are arranged in ascending order. The data set has six elements, so the median is the mean of the third-highest and third-lowest elements:

It is impossible to tell which is greater.

For example, if all nine students weight 150 pounds, their median weight is 150, and their total weight is equal  pounds. 

If, however, their weights are 

then the median of their weights - the middle value - is still 150 pounds, but the sum of their weights is 

The median of eleven elements is the element in the middle when arranged in ascending order - that is, the sixth-lowest element. If the box is replaced with a 40, the data set becomes

making 40 the sixth element.

If the box is replaced with a value less than 40, then the lowest five values are 20, 30, 30, 40, and the new element, and the sixth element is 40.

If the box is replaced with a value greater than 40, then the lowest five values are 20, 30, 30, 40, 40, and the sixth element is 40.

No matter what, the median is 40.

In ascending order, their weights are:

The median is the average of the two numbers in the middle of the set, which are 159 and 166:

The median weight is 162.5 pounds.