From well shuffled standard pack of 52 playing cards,one card is drawn. What is the probability that it is either a red card or black card?
P(red cards)=26/52
P(black cards)=26/52
P(red or black cards)=26/52+26/52=1
If the standard deviation of 0, 1, 2, 3 ......... 9 is K, then the standard deviation of 10, 11, 12, 13 ........... 19 will be:
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