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Math Help - Finding the median question

  1. #1
    Junior Member silvercats's Avatar
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    Finding the median question

    how to find the median of this?is there any formula for that?

    order number----| 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 |

    frequency--------|__2 __|___5__|__9___|__21__|__ 9 __|__4__|
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  2. #2
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    The actual median itself cannot be found, but you can find which class interval it lies in.
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  3. #3
    Junior Member silvercats's Avatar
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    @pickslides are you pretty sure?because in the tutorial,they have done some thing(which i don't understand) and taken an answer.answer to this question should be 26.642 as book says.But i don't know how did they find it.
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  4. #4
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    The median is the middle value, in this case n=50 therefore the median is between the 25th and 26th value.

    But in your example we don't have actual values only the count of values within an interval. You can say that the median lies in the 25-29, some books will say the median is the middle of this interval, i.e. 27 but that raises new questions, is your data set discrete or continuous?
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  5. #5
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    You don't happen to know this guy?

    http://www.mathhelpforum.com/math-he...ers/vonnemo19/
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  6. #6
    Junior Member silvercats's Avatar
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    Quote Originally Posted by pickslides View Post
    no.who is that guy?
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  7. #7
    Junior Member silvercats's Avatar
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    in the book's example

    order number----| 60-64|65-69 | 70-74 | 75-79 | 80-84 | 85-89 |

    frequency--------|__21 __|___27__|__28___|__14__|__ 6 __|__4__|

    median =69.5+(5/28)*2=69.83

    Can anybody tell me what have they done in this book to find the median?
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  8. #8
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    Quote Originally Posted by silvercats View Post
    no.who is that guy?
    Just someone who happens to have the same avatar, nothing more.
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  9. #9
    Junior Member silvercats's Avatar
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    Quote Originally Posted by pickslides View Post
    Just someone who happens to have the same avatar, nothing more.
    oh hehe yeah
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