Ineed to find the mean variance and standard deviation of the probability distribution rounded to the nearest hundredth, survey was taken of students in a high school to determine the number of extra curricular activities each student engages in

activities is 0-7

students is 10,30,25,45,63,21,17,3

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?