Mathematics, 24.07.2019 13:30 isabellainksow87vn

If the formula were used to find the r-value of the following data, what would be the value of to three decimal places? x y 3 2 5 7 9 10 11 14 14 18 a. 6.181 b. 5.528 c. 3.980 d. 4.450

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Answer from: karenrivera22

0.0017947

Step-by-step explanation:

x y xy x^2 y^2

32 6 9 4

57 35 25 49

910 90 81 100

1114 154 121 196

1418 252 196 324

N = 5

$\sum x=3+5+9+11+14=42$

$\sum y=2+7+10+14+18=51$

$\sum (xy)=6+35+90+154+252=537$

$\sum x^2=9+25+81+121+196=432$

$\sum y^2=4+49+100+196+324=673$

Now to find r we will use the formula:

$r =\frac{N\sum(xy)-\sum x \sum y}{(N \sum x^2 -(\sum x)^2)(N \sum y^2 -(\sum y)^2)}$

Substitute the values to find value of r

$r =\frac{5(537)-(42 \times 51)}{(5 (432) -(42)^2)(5(673) -(51)^2)}$

r =0.0017947

Thus the value of r is 0.0017947

Answer from: Quest

i think it would be 43 movies that would have to be watched.

step-by-step explanation:

think about it. for the second plan, every month is 8 dollars. 8 x 12= 96. so thats the number for the second plan. now for the first plan, its annual meaning you have to pay 10 dollars every year. so now you have to get an equivalent amount of 86 since 96-10=86. 86 divided by 2 since every movie costs 2$ then you would have to watch 43 movies a year to get the same as the second plan. i really hoped this . have a wonderful day as well!

Answer from: Quest

step-by-step explanation:

i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.

i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).

in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.

then the standard form of the equation is finding an expression of y in function of x

y-1=1/4*(x-12)

y=x/4-3+1

y=x/4-2

hope that .

do you confirm there was a mistake in the question?

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If the formula were used to find the r-value of the following data, what would be the value of to th...