According to a national census for a particular country, the proportion of families with three or more children (aged less than 25) declined from 45% in 1961 to 19% in 2011. Suppose we estimate that this proportion is 17.8% this year. In order to market products to large families, we randomly select 2500 families in this nation for a survey. Complete parts (a) through (d) below a) What is the expected proportion of families with three or more children in our sample? The expected proportion is 17.8 % (Type an integer or a decimal. Do not round.) b) In our sample, we find 19.4% of the families have three or more children. What is the probability of a proportion as high as 19.4% or higher in the sample if our estimate of 17.8% in the population is correct? The probability is 0.3340 (Round to four decimal places as needed.)