Aschool assembly has 60 students in attendance and 75% of them are first graders . how many first-graders were at the assembly

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample

The poll report includes a table titled, “americans using cash now versus five years ago, by age.” the age intervals are not equal. why do you think the gallup organization chose the age intervals of 23–34, 35–54, and 55+ to display these results?