At the district competition for 5th grade jump-roper of the year, the following number of jumps without stopping were recorded per student:
203,245,237,233,90,100,100,277,265, 264,265,285,288,291,
291,290,300,224,200,257,290,279,266 ,288
what is the mean number of jumps, rounded to the nearest hundredth?
what is the median number of jumps?

First, we arrange the data from least to greatest:
  90, 100, 100, 200, 203, 224, 233, 237, 245, 257, 264, 265, 265, 266, 277, 279, 285, 288, 288, 290, 290, 291, 291, 300

There are 24 data all in all. The mean is calculated by dividing by 24 the sum of all the data.
                        mean = (5828)/24242.83

The median of the number of jumps is the mean of the 12th and 13th term.
                          265