Question

The following stem-and-leaf plot represents the times in minutes required for 26 co-workers to commute to work. Use the data provided to find the quartiles.

Answer 1

Counting from the leave part of the plot, we have 26 numbers. So the lower quartile should fall at the middle or median of the first 13 numbers.

Let me show you using a diagram

From the diagram, I have circled the first 13 numbers, as you can see.

Now, the median or the middle number of the first 13 numbers is 2.

Taking the 2 at the stem part, and this midian 2 at the leaf part, we have 22.

Hence, the first quartile is 22