18. in a survey of 2400 people, it was found that 1800 people use
cellular phones. what percent of the people do not
use cellular phones?
18.

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

If the value of cos330°is√3/2 then find cos 165°.