Keith asked 30 people whether they knew how to play whist or dominoes. fifteen of them knoew how to play whist and 20 knew how to play dominoes. five people did not know how to play either game. create a venn diagram to determine how many knew how to play both games.

What are the relative frequencies, to the nearest hundredth, of the rows of the two-way table? group 1: a 15 b 45 group 2: a 20 b 25

Josephine has a great garden with and area of 2x2 + x - 6 square feet

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.