Single adults:According to a Pew Research Center analysis of census data, in 2012, 20% of American adults ages 25 and older had never been married.(Source: Wang, W., and Parker, K. (2014). Record Share of Americans Have Never Been Married. Pew Research Center.)

If we repeatedly obtain random samples of 50 adults, what is thestandard deviation of the sampling distribution of sample proportions? Enter your answer in decimal form rounded to two decimal places.