For example, here is how the next fiscal year breaks down: First quarter (Q1): Oct. 1 through Dec. 31 Second quarter (Q2): Jan. 1 through March 31 Third quarter (Q3): April 1 through June 30 ...

To find the interquartile range, subtract the value of the lower quartile Q1 from the value of the upper quartile Q3. A school librarian ... of the table. In the example above, there are 40 ...