# 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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