# As math

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#1
Help!!!! Test tomorrow
A step by step approach in detail is needed I’ve tried these over and over
Last edited by Danyal124; 2 months ago
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2 months ago
#2
The area of each bar represents how many runners landed between those times. That is your 'frequency'.
The x axis is the time ranges. That is your 'group width'.
The y-axis is your frequency density. It's calculated by Frequency of runners / Group width = Frequency density
So if I had 4 runners (frequency) land a time between 55 mins and 65 mins that is a range of 10 mins(group width). My frequency density would be 0.4. On a graph the bar would have a width of 10 and a height of 0.4

So question 13
Frequency Density = 0.5 (y axis)
Group width = 12 (x axis difference between 78.5 and 90.5)
Frequency of runners / Group width = Frequency density
Frequency of runners / 12 = 0.5
Frequency of runners =0.5 x 12 = 6
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#3
(Original post by jay9330)
The area of each bar represents how many runners landed between those times. That is your 'frequency'.
The x axis is the time ranges. That is your 'group width'.
The y-axis is your frequency density. It's calculated by Frequency of runners / Group width = Frequency density
So if I had 4 runners (frequency) land a time between 55 mins and 65 mins that is a range of 10 mins(group width). My frequency density would be 0.4. On a graph the bar would have a width of 10 and a height of 0.4

So question 13
Frequency Density = 0.5 (y axis)
Group width = 12 (x axis difference between 78.5 and 90.5)
Frequency of runners / Group width = Frequency density
Frequency of runners / 12 = 0.5
Frequency of runners =0.5 x 12 = 6
Thanks!!
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#4
(Original post by Danyal124)
Thanks!!
Any hep on other questions
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2 months ago
#5
(Original post by Danyal124)
Any hep on other questions
Post what you've tried
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2 months ago
#6
(Original post by jay9330)
The area of each bar represents how many runners landed between those times. That is your 'frequency'.
The x axis is the time ranges. That is your 'group width'.
The y-axis is your frequency density. It's calculated by Frequency of runners / Group width = Frequency density
So if I had 4 runners (frequency) land a time between 55 mins and 65 mins that is a range of 10 mins(group width). My frequency density would be 0.4. On a graph the bar would have a width of 10 and a height of 0.4

So question 13
Please edit - it's against forum rules to post solutions
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#7
(Original post by Muttley79)
Post what you've tried
I tried to differentiate couldnt see where cos came from
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2 months ago
#8
(Original post by Danyal124)
I tried to differentiate couldnt see where cos came from
Which question?
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