Answer:
no correlation
Step-by-step explanation:
because the teeth brushing had nothing to do with their grade, it would be no correlation.
Answer:

Step-by-step explanation:
Given:
The given equation is.

Find the some of cube.
Solution:


----------(1)
The sum of the cube formula is given below.
-----------(2)
By comparing equation 1 and equation 2

substitute a and b value in equation 2



Therefore the sum of the cube 
Square root 2,025 to get 45.
Or, multiply 45 × 45 to get 2,025.
Answer: 45
Using the binomial distribution, it is found that the mean and the standard deviation of variable x are given as follows:

<h3>What is the binomial probability distribution?</h3>
It is the probability of exactly <u>x successes on n repeated trials, with p probability</u> of a success on each trial.
The expected value of the binomial distribution is:
E(X) = np
The standard deviation of the binomial distribution is:

In this problem, we have that the parameters are given as follows:
n = 4, p = 0.75.
Hence the mean and the standard deviation are given as follows:
- E(X) = np = 4 x 0.75 = 3.
More can be learned about the binomial distribution at brainly.com/question/24863377
#SPJ1