About 4% of the population has a particular genetic mutation. 600 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 600.

Alaptop computer is purchased for $1350 . after each year, the resale value decreases by 30% . what will the resale value be after 5 years?

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?