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Range is a measure of variation; mode is a measure of center. Range will tell you how much the data vary, mode does not tell you how much the data vary.
First they all tell you the percentages of something and they tell you peoples opinion on things.
please tell me what is actual risk
Indexes provide useful information including: Even with their limitations, indexes show trends and changes in investing patterns. They can give snapshots of market activity, even if they don't tell the whole story. Indexes provide a yardstick for comparison over time.
It enables us to tell the difference between observed and expected frequencies objectively as it is practically impossible to tell the difference just by looking at the data.