(Picture included) Can someone tell me the answers to these two questions?

4.
First, we convert the mean height to inches.
1 ft = 12 in., so multiply ft by 12 and add inches.
5 ft 4 in. = 5 * 12 in. + 4 in. = 64 in.

The mean is the arithmetic average.
To find it, you add all heights and divide by the number of students.
If you divide the sum of the heights by  the mean height, you get the number of students.

Now we divide the sum of the heights by the mean height in inches.
(1472 in.)/(64 in.) = 23

There are 23 students.

5.
The median is the middle value.
If you write all values in ascending order, the median is the value in the middle.
There are 23 students.
If the median height is 5 ft 2 in., then there are 11 heights to the left on the list, and 11 heights to the right on the list.
12 heights are 5 ft 2 in. or taller, and 11 heights are shorter.