Video Transcript
Find the median number of laps that
Charlotte ran this week.
In the graph below, we have day on
the 𝑥-axis, showing data for days one to seven, and laps on the 𝑦-axis. So, for example, if we look at the
first point on the graph, we can see that Charlotte ran 20 laps on day one and 10
laps on day two. We need to find the median number
of laps that Charlotte ran. And we can recall that the median
of a data set is the middle value, when the data is ordered, either in ascending or
descending order.
So let’s consider the number of
laps that Charlotte ran each day. The first day was 20 laps. The second was 10. The third day was six, and the
following day another six, then 18, 16, and eight laps on the days after this. Now, remember that to find the
median, we must put the values in order. So let’s use an ascending
order. That means we’ll have six, six,
eight, 10, 16, 18, and 20 laps.
Next, we find the middle value. As there are seven values from the
seven days Charlotte recorded her runs, the median will be the number at the fourth
position. And that means that the median
number of laps that Charlotte ran is 10 laps.
