Determine the mean.
Take the mean from the score.
Square that number.
Take the square root of the total of squared scores. Excel will perform this function for you using the command =STDEV(Number:Number).
one card is drawn from a well shuffled pack of 52 playing cards. what is the probability that the
drawn card is a black ace
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therefore hcf =242424
and no.of pencilsin one pack =3