Question 682259
I AM GIVING YOU AN EXAMPLE,SO YOU WILL UNDERSTAND IT BETTER
600+470+170+430+300======1970======394
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YOU HAVE 5 DIGITS SO YOU WILL USE 5
DIVIDE 5 INTO 1970======394YOUR MEAN
SUBTRACT ALL( 5 )
DIGITS FROM YOUR MEAN(394)
VARIANCEσ^2=206^2  +  76^2  +  (-224)^2  +  36^2  +  (-94)^2
          42,436      5,776     50,176      1,296     8,836
YOU WILL MULTIPLY EACH BY ITSELF TO GET YOUR ANSWER 206^2X206^2=42,436
ADD EACH ANSWER  YOU WILL GET===108,520
DIVIDE 108,520 BY 5 WHICH WILL EQUAL=======21,704
THIS IS YOUR VARIANCE===21,704
STANDARD DEVIATION IS JUST THE SQUARE ROOT OF YOUR VARIANCE
σ=√21,704=147.32=147
ALL YOU HAVE TO DO IS TYPE IN 
√21,704 THEN HIT YOUR EQUAL SIGN GIVES YOU YOUR ANSWER