Asmall train at an amusement park is carrying passengers. half of the passengers are 4 years old, 1/10 are 5 years old, 3/10 are 6 years old, and 1/10 are 7 years old. what is the expected age for one of the passengers on the train? a. 5 years b. 5.5 years c. 6 years d. 6.1 years

Two numbers have a sum of -19. one number is x. what expression represents the other number?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?