What is s-(-10)-2 i need help

On a architect's drawing of a house, 1 inche representa 1.5

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude