4. A study of 30 fathers was completed in which the fathers were asked the highest level of education they had completed. 10 completed only elementary school, 10 completed elementary school and high school; 7 completed elementary school, high school and college; 3 completed elementary school, high school, college and graduate school. What was the cumulative percentage of fathers who completed only elementary school?

Answer:The cumulative percentage of fathers who completed only elementary school is nearle 33%.Step-by-step explanation:Among 30 fathers:10 completed only elementary school;10 completed elementary school and high school;7 completed elementary school, high school and college;3 completed elementary school, high school, college and graduate school.You can fill these numbers into the table:[tex]\begin{array}{cccc}&\text{Frequency}&\text{Cumulative frequency}&\text{Cumulative percentage}\\\text{Elementary school}&10&10&\approx 33\%\\\text{El. and high school}&10&20&\approx 67\%\\\text{El., high schools and college}&7&27&90\%\\\text{El., high, college and grad. sch.}&3&30&100\%\end{array}[/tex] The cumulative percentage of fathers who completed only elementary school is nearle 33%.