One out of six white Americans have blue eyes.
95% of Americans live to be twelve.
Little more than 1% of Americans have PhDs.
What percentage of Americans have tattoos
There is no standard collective noun for a group of PhDs. Some that are close are a faculty of academics or a pomposity of professors.However, collective nouns are an informal part of language. Any noun the suits the situation can function as a collective noun; for example, a pomposity of PhDs, a profusion of PhDs, a puzzlement of PhDs, etc.
is this correct: This is the PhDs' room. Or is it: This is the PhD's room
The plural form of Doctor of Philosophy can be abbreviated as either Ph.D's or PhD's.
percentage of Americans live to be 93?
The question is ambiguous, Are you interested in what percentage of Asians are Americans, or what percentage of Americans are of Asian origin?
The percentage of Americans that invest in capital markets is: 32%.
People with PhDs