In the xy -plane, 8 data points lie on the line with equation y = 40 + 5x. If the standard deviation of the coordinates of the 8 points is 4.6, what is the standard deviation of the y -coordinates of the 8 points?
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Answered by
3
Answer:
Substituting (r,s) in the original equation:
y=3x+2 => s=3r+2 => 3r-s+2=0.
Question : is 3r-s-2=0. ??
statement 1 - (3r+2-s)(4r+9-s)=0 => (3r+2-s)=0 or (4r+9-s)=0
Not sufficient
Statement 2 - (4r-6-s)(3r+2-s)=0 => (3r+2-s)=0 or (4r-6-s)=0
Not sufficient
Combining 1&2 ->
common result (3r+2-s)=0
Sufficient.
Answer - C
Answered by
0
Answer:
Step-by-step explanation:
23
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