same here, doing masters but watching his vedios

How's this bound to the problem?

@@matemaatika-math i know its out of topic, sorry but irelly need to know easy way how to do it

@@maulanarizkyfauzi2669 Do you have an example for that? Is that what you're looking for: kzfaq.info/get/bejne/p6qofJqSzLXZiok.html

You get the mean by adding up the values on the x bar and divide the result by the number of values. x bar isn't mean nor nice, it's just a bar.

x bar is the mean of a sample

I personally find it extremely useful to have the ability to (roughly) visualize and manipulate stuff in your head, be it graphs, symbols, notations and similar. If you can visualize, say, the graph of a parabola, then it's much easier to think about quadratic equations, just to give one simple example. It actually surprises me how much imagination and creativity help while doing maths. Counterintuitive, but true, at least based on my own experience.

@@Merione correct

Yes it is

No, a hardworking student who does large amounts of practice will perform far better than the majority of students who merely have a high IQ. This is true of most things.