Algebra

posted by .

I am having trouble with finding the 1st and 3rd quartiles of a set of data. For example, let's say the data is:
4, 9, 11, 16, and 24<- these are cumulative frequencies. The median (or 2nd percentile)is 11, right? My teacher says it's 12. Then for 3rd quartile I got 20, but my teacher says 18. Can someone explain to me what I am doing wrong?
Thanks.

  • Algebra -

    The median is always the 50th percentile or 2nd quartile.

    You seem to give frequencies (Y-axis/ordinate values), but do not give the quality/quantity in which these frequencies occur (X-axis/abscissa).
    These are frequencies of what? Height? Weight? Test scores?

    The quartiles would be given in terms of the abscissa values.

    I hope this helps. If not, repost with more complete data. Thanks for asking.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math- HELP

    How do I Find the first and third quartiles, Q1 and Q3, of the following set of numbers?
  2. Math

    I am supposed to find the 1st and 3rd quartiles of the following.And they are multipul choice: 0.08,0.16,0.18,0.20,0.22,0.25,0.27,0.27,0.28,0.32 Q1; 0.16+0.18=0.34÷2=0.17 Q3; 0.27+0.28=0.55÷2=0.275(.28) A. 0.18;0.27 B. 0.18; 0.28 …
  3. math

    Find the first, second, and third quartiles of the data. 15, 6, 1, 13, 5, 11, 3, 8 My answer: 1st quartile: 3 2nd quartile: 7 3rd quartile: 13 Am I right?
  4. MTH233/statistics UOP

    Find one quantitative and one qualitative data set from a reliable source and determine the best way to present that data graphically. Show your graph and explain your reasoning for choosing this presentation method. When might the …
  5. math

    4. For Questions 4-7, use the following data: The number of file conversions performed by a processor per day for 10 days was: 15, 27, 25, 28, 30, 31, 22, 25, 27, 29 What is the arithmetic mean of the data?
  6. statistics

    Find 10-th, 60-th and 75-th percentiles in each of your data set, then write down each value that corresponds to those percentiles. Now use those values to find sample percentiles empirically (Suppose value “a” corresponds to 10-th …
  7. statistics

    Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. 2. Using the data …
  8. statistics help please!

    Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. (is this 75th …
  9. statistics

    I am seeing some inconsistencies with regards to finding the upper and lower quartiles when you you have an odd number in your data set. Which is correct, counting the median in both your upper and lower set, or ignoring it?
  10. statistics

    Consider the following data on lengths of 30 pieces of metal. 18 26 15 17 7 27 24 17 10 17 23 29 28 18 10 23 16 6 12 26 5 12 23 22 24 14 16 26 19 22 a. Define an outlier. Give an example of an outlier from the above data set. [3] b. …

More Similar Questions