Answer:
11.C
12.B
Step by step explanation:
Answer:
We have a strong negative relationship between the variables.
Step-by-step explanation:
Given two random variables X and Y, it is possible to calculate the covariance as Cov(X, Y) = E(XY)-E(X)E(Y). We have E(X)=5, E(Y)=6 and E(XY)=21. Therefore Cov(X,Y)=21-(5)(6)=21-30=-9. On the other hand, we know that the correlation of X and Y is the number defined by
and because in this particular case we have V(X)=9 and V(Y)=10, we have
= -0.9487. Therefore, we have a strong negative relationship between the variables.
11.85 which rounds to 12, 12 should be the correct answer
Answer:
5.2
Step-by-step explanation:

To solve for x, we want to isolate x. To do this, we need to multiply both sides by 4.

Multiply the numerators and the denominators separately.
4 • 17 = 68
1 • 13 = 13

Divide.
68 ÷ 13 = 5.23
Round to the nearest tenth.
5.2
Hope this helps!