SoWhat2237
06.05.2020 •
Mathematics
A regression line has a slope of 1.885 if the mean of the x-coordinates of the data points is 3448 and the means of the y-coordinates is 12.312 what is the y-itercept of the line to three decimal places
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Ответ:
The value of the slope c is -6,487.168
Step-by-step explanation:
In this question, we are told to find the y-intercept of a regression line model.
Mathematically, a regression model having a single dependent variable y and a single independent variable x can be represented by the equation of a straight line.
This is the same as;
y = mx + c
where m is the slope and c is the y intercept
Now from the question, we know we are to calculate c , where y is the mean of the y-coordinates at a value of 12.312, where x is also the mean of the x-coordinates at a value of 3448 and an m-value which is the slope at 1.885
We plug these values into the straight line equation to yield;
12.312 = 1.885(3448) + c
c = 12.312 - 1.885(3448)
c = 12.312 - 6,499.48
c = -6,487.168
Ответ:
240 boys and 160 girls
Step-by-step explanation: 3 + 2 = 5
400/5 = 80
80 times 3 = 240
so 240 boys
hope this helps mark me brainliest if it did