Find the difference between median and mode of the following data:
2, 3, 5, 7, 2, 3, 3, 5, 7 and 9.  

2, 3, 5, 7, 2, 3, 3, 5, 7, 9.

Mode:

The mode is the number that appears most frequently in the data set.

Median:

The median is the middle value of a data set when it is arranged in ascending order. If there is an even number of values, the median is the average of the two middle numbers.

Arranging the data in ascending order:

2, 2, 3, 3, 3, 5, 5, 7, 7, 9.

Now, for mode:

We can see the number 3 appears 3 times, which is more frequent than any other number.

So, mode = 3

Now, for median:

The data set has 10 values: 2, 2, 3, 3, 3, 5, 5, 7, 7, 9.

The two middle numbers are the 5th and 6th numbers: 3 and 5.

So,

Median =$$\frac{3 + 5}{2} = \frac{8}{2} ​=4$$​​

Now, the difference between the median and mode;

Difference = Median - Mode = 4 - 3 = 1. 

Thus, the difference is 1