Variables mean whose values are not constant, such as x, y , z
this is in algebra
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It mean that there is no correlation between the two variables. The variables are the same.
mean dose x mass = integral dose
"If coefficient of correlation, "r" between two variables is zero, does it mean that there is no relationship between the variables? Justify your answer".
There doesn't exist such a thing. What does exist are standardized variables, which are variables with mean = 0 and standard deviation = 1
A,b,c are variables. They usually refer to the sides of a triangle, but also can mean just normal variables.