Standard Deviation of Arithmetic Progression? [Korean CSAT 2003]

The final problem from the South Korean College Scholastic Ability Test (CSAT) for 2003 application. Can you find the standard deviation σ of this arithmetic progression (with common difference d) and calculate the value of σ/d?
#KoreanCSAT #statistics #StandardDeviation #ArithmeticProgression #sequences #sigma #SumOfSquares #suneung #CSAT2003
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