Take a look at the bell-curve graph here. But what it really represents is how data is often distributed around the mean or average. What I mean by that is that there is always variability in data. If you measured the same thing one hundred times the exact same way, you would probably not get the exact same result each time. When you weight yourself, the scale gives you a number.
If you have a pretty cheap scale like me, the result you got might have varied slightly from one weighing to the next. Now imagine that you weigh yourself one hundred times throughout the day. The weight would vary a lot. Well, throughout the day you get dressed, you eat food, you drink water, and do any number of other things that will affect how the scale reads your weight.
But if you graphed each number on any kind of frequency chart, it would have a shape similar to that bell curve. If you did this same measurement times, the shape of the curve would look more pronounced.
That center line on the graph is the mean or the average. In the weight example, it would be your average weight for the day. Now, the width of the curve tells us how spread out the data is, or rather, how variable it is. This is a cardinal principle. Study in triads or quads of students at least once every week. Verbal interchange and interpretation of concepts and skills with other students really cements a greater depth of understanding.
Remember, later in life when you need to use a statistical technique you can always look the formula up in a textbook. Work as many and varied problems and exercises as you possibly can.
Hopefully your textbook is accompanied by a workbook. You can not learn statistics by just reading about it. You must push the pencil and practice your skills repeatedly. Look for reoccurring themes in statistics. Price depends upon multiple factors like subject, grade, number of questions etc. Your solution will be emailed to you with steps and explanations.
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