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anonymous

  • one year ago

Please help me with box plots.

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  1. anonymous
    • one year ago
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  2. jtvatsim
    • one year ago
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    The most important thing to know with box plots is where the "Quartiles" are and what the mean. Here's a diagram:|dw:1439235482846:dw|

  3. jtvatsim
    • one year ago
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    So, Q1 marks the spot where 25% of the data is to the left, the median marks the spot where 50% of the data is to the left, and Q3 marks the spot where 75% of the data is to the left. Let's identify Q1 and Q3 in your question first.

  4. jtvatsim
    • one year ago
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    So, it seems to me that Q1 = 1 year and Q3 = 6 years in your question. Do you agree with that?

  5. anonymous
    • one year ago
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    Yes i do

  6. jtvatsim
    • one year ago
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    Alright, perfect. So, now we need to figure out what the percentages translate to in our question.

  7. jtvatsim
    • one year ago
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    We have 40 schools. So some important percentages will be: 25% of 40 = 10 50% of 40 = 20 75% of 40 = 30

  8. jtvatsim
    • one year ago
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    Our job is to figure out how many schools are between Q1 and Q3 (that is the same as more than 1 and less than 6)

  9. jtvatsim
    • one year ago
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    |dw:1439235877341:dw|

  10. jtvatsim
    • one year ago
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    |dw:1439235933747:dw|

  11. jtvatsim
    • one year ago
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    I haven't fully explain the diagrams I just posted, but can you see the reasoning?

  12. anonymous
    • one year ago
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    Yes

  13. jtvatsim
    • one year ago
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    Perfect! Than you are done! P.S. In general 50% of the data is always between Q3 and Q1. So we could have solved this problem by just noticing that the question was asking for the data between Q3 and Q1, which would have just been 50% of 40 = 20.

  14. anonymous
    • one year ago
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    20 schools

  15. jtvatsim
    • one year ago
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    That is it!

  16. anonymous
    • one year ago
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    Thank you so much i appreciate it (:

  17. jtvatsim
    • one year ago
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    You're welcome! Good luck!

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