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The table shows the linear relationship between the stride r

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Carcass
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The table shows the linear relationship between the stride r [#permalink] New post   31 Dec 2019, 08:16
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#greprepclub The table shows the linear relationship between .jpg
#greprepclub The table shows the linear relationship between .jpg [ 24.37 KiB | Viewed 6059 times ]


The table shows the linear relationship between the stride rate of a runner, in numbers of strides per second, and the speed index. This linear relationship holds for stride rates per second to 5.00 strides per second. According to this linear relationship, what is the speed index when the runner with a stride rate of 3.80 strides per second?

Speed Index
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Ashgre
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Re: The table shows the linear relationship between the stride r [#permalink] New post   01 Jan 2020, 06:39
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For every 0.25 strides/sec there is an increment of 1 speed index. Based on this, 3.75 strides/sec will be equal to speed index of 8.

To find out the remaining speed index of 0.05 strides/sec I used ratios: 0.25/1 : 0.05/x --> x = 0.2.

Therefore, 8+0.2 = 8.2.

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Re: The table shows the linear relationship between the stride r [#permalink] New post   20 Aug 2021, 16:19
set speed index as dependent on stride rate: speed=m∗stride+b
m=5−43−2.75=4
speed=4∗stride+b, plug in (3,5)
5=4∗3+b, b=−7
when stride=3.8, speed=4∗3.8−7=8.2 is the answer


Carcass wrote:
Attachment:
#greprepclub The table shows the linear relationship between .jpg


The table shows the linear relationship between the stride rate of a runner, in numbers of strides per second, and the speed index. This linear relationship holds for stride rates per second to 5.00 strides per second. According to this linear relationship, what is the speed index when the runner with a stride rate of 3.80 strides per second?

Speed Index
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8.2
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gmatclubot
Re: The table shows the linear relationship between the stride r [#permalink]
20 Aug 2021, 16:19
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