3. Calculate Box and Whisker Plots from the following data
`3,13,11,15,5,4,2`

Solution:
Box and Whisker Plots :
`3,13,11,15,5,4,2`

Steps of Five-Number Summary

Step-1: Arrange the numbers in ascending order
`2,3,4,5,11,13,15`

Step-2: Find the minimum value
Minimum `=2` (the smallest number)

Step-3: Find the maximum value
Maximum `=15` (the largest number)

Step-4: Find the median
The median is the middle number in a sorted data set and N is the total number of elements
If N is odd then the median is a single middle number, and if N is even then the median is the average of the two middle numbers.

`2,3,4,5,11,13,15`

`N=7` is odd, so median is the middle number at position 4

We have `5`

`:.` Median `=5`

Step-5: Place parentheses around the numbers above and below the median.
`{2,3,4},5,{11,13,15}`

Step-6: Find `Q_1` by finding the median for lower half of data(left of the median)

`2,3,4`

`N=3` is odd, so median is the middle number at position 2

We have `3`

`:.Q_1=3`

Step-7: Find `Q_3` by finding the median for upper half of data(right of the median)

`11,13,15`

`N=3` is odd, so median is the middle number at position 2

We have `13`

`:.Q_3=13`

Step-8: Summary found in the above steps.
Minimum `=2`

`Q_1=3`

Median `=5`

`Q_3=13`

Maximum `=15`

---