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An variable in science something that can be changed and example is facts and figures .
Yes. It is a continuous variable. As used in probability theory, it is an example of a continuous random variable.
The horizontal axis usually represents the independent variable. One example is time. Time will change regardless of what problem you are analyzing with a graph. It could be seconds elapsed in a motion graph. Or it could be months, in a sales chart, for example. Distance could be another example of an independent variable. It just depends on what type of problem you are graphing.
A variable in algebra is an unknown quantity as for example in the term 5y the variable is y
A dependent variable is simply a variable (for example: y) whose value depends on that of another.