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The following box plot shows the number of years during which 40 schools have participated in an interschool swimming meet: A box and whisker plot is drawn using a number line from 0 to 10 with primary markings and labels at 0, 5, 10. In between two primary markings are 4 secondary markings. The box extends from 1 to 6 on the number line. There is a vertical line at 3.5. The whiskers end at 0 and 8. Above the plot is written Duration of Participation. Below the plot is written Years. At least how many schools have participated for more than 1 year and less than 6 years?
4 schools 8 schools 10 schools 20 schools
I think the answer is 4
The vertical lines divide the data into quartiles (each is 25%). If you're saying 1 and 6 is the second and fourth lines, what percentage of data is between them? |dw:1439233369606:dw|
|dw:1439233654961:dw| Not quite. If each of those boxes is 25% and you have two of them, how many is that together?
This the actual question
25%+25%=50% 50% of 40 = 20