math!

what point represents the 3rd quartile in the box and whisker plot?

. = point

.5, .25, .35, .50, .70

the numbers will be arrange like this if it was in a box and whisker plot

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  1. Arrange the numbers in ascending order:
    .5, .25, .35, .50, .70
    The median is the middle number of the whole set, namely 0.35.

    The third quartile is the median of the upper half, namely the median of
    {0.35, 0.50, 0.70}

    Can you find the third quartile?

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  2. what?

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  3. is it .35

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  4. We have already worked out the median as 0.35.

    Now we need to find the third quartile, which is the median of the upper half of numbers, namely the median of
    {0.35, 0.50, 0.70}

    Can you give it another try?

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  5. is it .50

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  6. Correct!
    Now can you find the first quartile?

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  7. um .35

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  8. Correct, with corrections on my part.

    Sorry, I did not realize that the numbers have not been put in order!
    Instead of
    .5, .25, .35, .50, .70
    it should be put in order as:
    0.25, 0.35, 0.5, 0.50, 0.70

    So the median is the middle number of the five, or 0.5.

    The upper quartile is the middle number of the upper half, {0.5, 0.50, 0.70} and your answer of 0.50 is still correct.

    For the first quartile, you need to find the median (middle number) of the lower half of the numbers, {0.25, 0.35, 0.5}, so 0.35 is also correct.

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  9. Mathmate please help me...

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  10. If you are referring to the following post:
    http://www.jiskha.com/display.cgi?id=1275351386
    post a sample problem where you have difficulties and ask for help.
    The answer to a general question will usually be responded by a link to the subject, such as:
    http://www.purplemath.com/modules/ineqsolv.htm
    which is also helpful, because you need to read up on the subject before you even know what to ask.

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