Question

The average wind speeds for one year at 44 climatic data centers around the United States are as follows:

Answer 1

The stem and leaf diagram is shown below

There are a total of 48 data

Question a:
The frequency in the stem for 9 to 9.9 is 13 data

Question b:
The location of the first quartile is given by $\frac{n+1}{4}$, where 'n' is the number of data

We have n = 48

Location of the first quartile is at $\frac{48+1}{4}= \frac{49}{4}= 12.25$ rounded down to 12

The value of the lower quartile is on the $12^{th}$ on the diagram which is 8.7