About 77% of young adults think they can achieve the American dream. Determine if the following statements are true or false, and explain your reasoning.

(a) The distribution of sample proportions of young Americans who think they can achieve the American dream in samples of size 20 is left skewed. 

(b) The distribution of sample proportions of young Americans who think they can achieve the American dream in random samples of size 40 is approximately normal since n > 30. 

(c) A random sample of 60 young Americans where 85% think they can achieve the American dream would be considered unusual. 

(d) A random sample of 120 young Americans where 85% think they can achieve the American dream would be considered unusual.