The average score on an aptitude test is 80 with a standard deviation of 10. one person scored a 95. what is that person's z-score?

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

What is the 12th term of b(n)=-4-2(n-1)

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0