2 years ago

This is a standard deviation contest. Which of the following sets of four numbers has the smallest possible standard deviation?

Mathematics

1 answer:

Maksim231197 [3]2 years ago

6 0

B option is right I think.

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$x-\ Jan's\ destination\\\\y-\ Mya's \ destination \\\\ z-\ Sara's\ destination\\\\\
x+y+z=64\\
x=y\\
z-8=2x\\\\
x+x+z=64\\
z=2x+8\\\\
2x+2x+8=64\\\\
4x+8=64\\\\
4x=64-8\\\\
4x=56\ \ |:4\\\\x=14\\\\z=2x+8=2*14+8=28+8=36\\\\ Sara\ ran\ 36\ miles.$

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It's D, hope I helped ;)

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