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CBSE Sample Papers for Class 9th, 10th, 11th and 12th are available online on many websites for all subjects including Maths. You can access them for free. Also you can buy sample papers books online. Links to free sample papers and online purchase are given below in related links.
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Here's how you do it in Excel: use the function =STDEV(<range with data>). That function calculates standard deviation for a sample.
because its faster and then when you use a sample you can easily make accurate predictions about what would/will happen next
Better the results