Histogram question AS
Can somebody please explain how I would find the frequency densities for the 2 missing classes below?
I've tried lots of things but can't get there.
The working that I left below was an attempt to find the scale for the frequency density if that's even helpful and/or right.
Thank you
I've tried lots of things but can't get there.
The working that I left below was an attempt to find the scale for the frequency density if that's even helpful and/or right.
Thank you
(edited 2 years ago)
Original post by mqb2766
Without doing it, you have two unknowns for the two bars and one piece of info relating them (four times as many ...).
You also know they corrspond to 40 swimmers.
You also know they corrspond to 40 swimmers.
Oh so if I let x = height for 30 to 25 And y = height 40 to 45,
Then
5(5x)=5y
So y=4x
And 10(x+y)=40
Solving both gives x=4/5 and y=16/5 ?
If this is the case, how do I then find the heights of the others for the final calculation?
Original post by mqb2766
In terms of numbers, the two histograms must be 8 and 32 as they sum to 40 and one is 4 times the other. You got the scaling factor for the other bars, so you can convert them to numbers. So whats the problem with finishing?
Oh so the working I showed earlier was correct for the SF?
Edit:
If so I've done this...
Im not sure how to get to 72 though
Plus the 17... i think would be required height, but multiplying by 43-25 gives over 300 which isn't right
(edited 2 years ago)
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