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# Maths A Level Statistics - Histogram Help watch

1. How do you find the frequency in a histogram? I tried using the formula frequency density x class width = frequency but I heard something about a multiplier needed which is then multiplied by the area?

2. Frequency is just area of the whole histogram
3. (Original post by N/A IS THE NAME)
Frequency is just area of the whole histogram
I know this but the answer was wrong apparently? A multiplier is needed. I'm not sure how the multiplier is worked out.
I know this but the answer was wrong apparently? A multiplier is needed. I'm not sure how the multiplier is worked out.
Are you talking about find the value of the yaxis
5. (Original post by N/A IS THE NAME)
Are you talking about find the value of the yaxis
The y axis is given as the frequency density and the x axis is given as mass.
How do you find the frequency in a histogram? I tried using the formula frequency density x class width = frequency but I heard something about a multiplier needed which is then multiplied by the area?

the area is proportional to the frequency
7. (Original post by sarah5)
the area is proportional to the frequency
I see, so how would I work it out in figures?
The y axis is given as the frequency density and the x axis is given as mass.
Then i dont think u need a multiplier- never heard of that.
I see, so how would I work it out in figures?
send me the question so i can explain it
10. (Original post by N/A IS THE NAME)
Then i dont think u need a multiplier- never heard of that.
Someone explained to me that a multiplier is needed due to the proportionality and whenever I look at the answer it's not just simply the cw x fd.
11. Then there must a bit of info in the question that relates the mass on the y axis to the frequency they are looking for- or something like this.
12. (Original post by sarah5)
send me the question so i can explain it
I'm not exactly sur ehow I can attach an image of the question as it's a screenshot.
13. (Original post by sarah5)
send me the question so i can explain it
I've converted the images to URL links:

https://s1.postimg.org/8j7ddg3li7/My_Math_1.png
14. okay for the first question
area=k*frequency
then you need to find k
so you have
the mass from 1-4
and its width (4.5-0.5)=4
the frequency density =0.5
so width*fd=k*freqency (which is 10 given in the table )
4*0.5/10 =k (0.2)

then you need to find the frequency for 5-6 where the width (6.5-4.5)=2 and fd =4
the frequency = 2*4/0.2 =40
and so on ...
hope u understand
15. (Original post by sarah5)
okay for the first question
area=k*frequency
then you need to find k
so you have
the mass from 1-4
and its width (4.5-0.5)=4
the frequency density =0.5
so width*fd=k*freqency (which is 10 given in the table )
4*0.5/10 =k (0.2)

then you need to find the frequency for 5-6 where the width (6.5-4.5)=2 and fd =4
the frequency = 2*4/0.2 =40
and so on ...
hope u understand
Thank you so much!! I finally understand!!
Thank you so much!! I finally understand!!
okay for the second question is the same idea
width*fd=k*frequency
they gave you the area and the frequency you have to find k
and then use k to find the frequency to other weights

I really like histograms every question has the same idea
so dont worry if you understand this !
<3 and good luck with your exam
17. (Original post by sarah5)
okay for the second question is the same idea
width*fd=k*frequency
they gave you the area and the frequency you have to find k
and then use k to find the frequency to other weights

I really like histograms every question has the same idea
so dont worry if you understand this !
<3 and good luck with your exam
Thanks so much! You're a life saver!! It's hard to remember and gets confusing sometimes. Thank you so much again!
18. F.d x Class width

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