If two letters are taken at random from the word HOME, what is the probability that none of the letters would be vowels?
P(first letter is not vowel) = 24
P(second letter is not vowel) = 13
So, probability that none of letters would be vowels is = 24×13=16
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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