Question

The number of crows observed per day on a certain field over a two-week period is listed below. What is a frequency table and histogram that represents the data? 1, 3, 2, 5, 10, 8, 9, 15, 0, 7, 12, 13, 6, 18

Answer 1

As a first step we are going to find the range, range is the difference between the least number and the greatst number in the set.

$\begin{gathered} \text{Range}=18-1=17 \\ \end{gathered}$

Now, calculate an approximate group size, by dividing the range by how many groups you would like.

Let's say we want 5 groups.

$\begin{gathered} \frac{17}{5}=3.4 \\ \text{Rounding up to 4} \end{gathered}$

The, we can pick a starting value, in our case we can start with a value of 0, then the groups would be: 0,4,8,12,16

Now, we can make the frecuency table:

To make an histogram of this data, we are going to put on the vertical axis, the frecuencies and on the horizontal-axis the intervals, and draw a bar extending from the lower value of each interval to the lower value of the next interval, like this: