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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- Apr 26th 2011, 07:51 PMsilvercatsFinding 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__| - Apr 26th 2011, 08:02 PMpickslides
The actual median itself cannot be found, but you can find which class interval it lies in.

- Apr 26th 2011, 08:10 PMsilvercats
@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.

- Apr 26th 2011, 08:17 PMpickslides
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? - Apr 26th 2011, 08:18 PMpickslides
You don't happen to know this guy?

http://www.mathhelpforum.com/math-he...ers/vonnemo19/ - Apr 26th 2011, 10:38 PMsilvercats
- Apr 26th 2011, 10:42 PMsilvercats
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? - Apr 27th 2011, 01:59 PMpickslides
- Apr 27th 2011, 09:18 PMsilvercats