Distribution of social class at age 16 for a sample of young adults Social Class as reported Frequency % Cumulative Frequency Cumulative % Upper 30 20.0 30 20 Middle 70 46.7 100 46.7 Lower 50 33.3 150 100 Total 150 100.0 According to this table what is the expected frequency of upper class? (must be a number, do not use any letter)