Mathematics
Grade10
Easy

Question

What is the formula for variance?

  1. straight S equals square root of fraction numerator sum left parenthesis x minus x with bar on top right parenthesis squared over denominator n end fraction end root
  2. straight s equals fraction numerator sum left parenthesis x minus x with bar on top right parenthesis squared over denominator n minus 1 end fraction
  3. Both a  and b    
  4. None of the above

The correct answer is: Both a  and b


    The formula for variance =
    space space space space s squared equals fraction numerator stack sum open parentheses x subscript i minus begin display style x with minus on top end style close parentheses squared with i equals 1 below and n on top over denominator n end fraction

rightwards double arrow s equals square root of fraction numerator stack sum open parentheses x subscript i minus begin display style x with minus on top end style close parentheses squared with i equals 1 below and n on top over denominator n end fraction end root

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