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"maths help.."

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Sun 17/12/06 at 18:16
Regular
Posts: 1,055
ok i need some help...

is it possible to work out the mean of grouped data? if it is i need someone to show me how to get the mean for this table.


Range.....Broadsheet....Tabloid
1.5-5.5......................6
5.6-10.5.....................6
10.6-15.5.......1............7
15.6-20.5.......1............4
20.6-25.5.......4............5
25.6-30.5.......2............2
30.6-35.5.......3  
35.6-40.5.......5  
40.5-45.5.......2  
45.6-50.5

the table is how many word there are in a sentence in a tabloid newpaper and a broadsheet newpaper    

Im sorry its so unclear... but im so confused by this i asked my brother and mother but they don't know how do do it either.

I would be extreamly grateful to anyone that could help me.
Mon 18/12/06 at 01:44
Regular
"Tornado Of Souls"
Posts: 5,680
you're welcome :p
Sun 17/12/06 at 19:37
Regular
Posts: 1,055
ok i think i have it.

Yay! I have it thank you both so much i could not have done it without you.
Sun 17/12/06 at 19:37
Regular
"Tornado Of Souls"
Posts: 5,680
It looks like you've divided by the wrong number.
You should divide by the total frequency for that row.

For example, the total frequency for tabloid is 6 + 6 +7 + 4 + 5 + 2

For tabloid I get an average of ~13.5 but there are some rounding errors in that due to the fact I ignored the decimal places.
Sun 17/12/06 at 19:32
Regular
"Devil in disguise"
Posts: 3,151
Been a while for me too but I'm fairly sure you need to be dividing by the totals for broadsheets/tabloids. All you're dividing by at the moment is number of rows >0.
Sun 17/12/06 at 19:10
Regular
Posts: 1,055
...............midpoint..tabloid...broasheet
...................................
1.5-5.5.........4.75......28.5.....0
5.6-10.5........8.05......48.3.....0
10.6-15.5.......13.05.....91.35....13.05
15.6-20.5.......18.05.....72.2.....18.05
20.6-25.5.......22.05.....110.25...88.2
25.6-30.5.......27.05.....54.1.....54.1
30.6-35.5.......32.05..............96.15
35.6-40.5.......37.05..............185.5
40.5-45.5.......42.05..............84.1
45.6-50.5.......47.05..............   
...............................404.2....554.9
...............................div.6....div.7
................................79.2714.67.366

surely this cannot be right?
my averages are higher than my results, please could you tell me where i went wrong?
Sun 17/12/06 at 18:42
Regular
"Tornado Of Souls"
Posts: 5,680
That looks right, yes.
Sun 17/12/06 at 18:40
Regular
Posts: 1,055
so the mid points go

3.5
8.05
13.05
18.05
23.05
28.05
33.05
38.05
43.05
48.05

yes?
Sun 17/12/06 at 18:22
Regular
"Tornado Of Souls"
Posts: 5,680
Bah, this isn't maths, this is stats.

But what you do, I seem to remember, is either learn to use your calculator's stats mode or, by hand, you take the mid point of each of the groups (half way between the upper and lower boundary of that group - for 1.5 to 5.5 it's going to be 3.5), then multiply the midpoint by the frequency of that set (record this in a new column), and then you add that column up and divide by the total frequency of everything.

Though it's been 3 years since I did that now and I could be wrong.
Sun 17/12/06 at 18:16
Regular
Posts: 1,055
ok i need some help...

is it possible to work out the mean of grouped data? if it is i need someone to show me how to get the mean for this table.


Range.....Broadsheet....Tabloid
1.5-5.5......................6
5.6-10.5.....................6
10.6-15.5.......1............7
15.6-20.5.......1............4
20.6-25.5.......4............5
25.6-30.5.......2............2
30.6-35.5.......3  
35.6-40.5.......5  
40.5-45.5.......2  
45.6-50.5

the table is how many word there are in a sentence in a tabloid newpaper and a broadsheet newpaper    

Im sorry its so unclear... but im so confused by this i asked my brother and mother but they don't know how do do it either.

I would be extreamly grateful to anyone that could help me.

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