It is assumed that the line plot below depicts the number of letters written by Waverly middle school students to abroad pen pals. Each x stands for ten students.
Count the number of x in the supplied line plot first.
In the line plot, there are a total of 30 x. It denotes that there are a total of a certain number of students.
30x = 30 x x= 300
There are four x when the number of letters is six, and three x when the number of letters is twenty, as shown in the diagram.
This indicates that 40 pupils wrote six letters and 30 students wrote twenty.
More than 6 but fewer than 20 letters were written by pupils.
300 - 40 - 30 = 230
The answer is 230