Let n = 172
______| | |___ 1's place
______| |____ 10's place
______|_____ 100's place
From the above place-value chart, can see understand the following:
__1 * 100 = 100
__7 * _10 = _70
__2 * __1 = __1
Total Value = 172 (i.e. when the above column of numbers is added together).
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For any given value, a cumulative frequency table of chart shows the number of observations which are less than or equal to that value.
Number lines
You use a line chart to show changes over time, for the same value. The line goes up or down, depending on the change over time. A column chart is more commonly used to compare independent values.
There isn't a specific chart for skewed data, but you could use a number of different charts to show that data is skewed. An Area chart could be used for example, or a column chart could also work. It would depend in the nature of the data.