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.
<span>trick question
One is neither a prime nor a composite number. A prime number is divisible by its self and one. One has only one
positive divisor. It cannot be written as a product of two factors,
neither of which is itself, so one is also not composite. It falls
in a class of numbers called units. These are the numbers whose
reciprocals are also whole numbers.</span>
Answer:
30 students
Step-by-step explanation:
3 students = 10% of the class.
x students = 90% of the class.
(If more, less divides. Let x be the subject. Since we know 10% of the class already, we have to find the remaining 90% that is 100% - 10% = 90%.)
x = 90%/ 10% × 3 students. ( the percentage signs cancel out and so do the zero's.)
x= 9/1 × 3 students ( 9/1 is the same as 9)
x= 27 students
(To find the total, you must add the 10% of the students to the remaining 90% of the students in the class.)
Total number of students in the class = 27 students + 3 students
= 30 students
The Answer Is 14.6
I just used a calculator to do it but if you want me to explain, I will.
A) 22.5 cm, 30 cm, and 37.5 cm
Divide 90 by 12 and multiply by three to check if any triplet has the answer in it. In this case only A
