Standard deviation??? COIN TOSS HELP! I tossed a coin 20, 30 and 50 times are recorded number of heads and tails and to get the deviation I first subtracted the expected from the observed for both heads and tails then I squared this value and divided it by the number of events and then toook the square root of this final value to get the standard deviation, its all in a chart and tells you what to do step by step. for 20 tosses = 0.70 standard deviation 30 tosses=0.70 standard deviation 50 tosses = 1.41 standard deviation The question says compare the standard deviations from the expected 20, 30, 50 tosses, what seems to be the relationship between the sample size and the standard deviation? I think as the sample size gets bigger the standard deviation also increases, im not sure can someone plz help me out plz.