If the results of a survey of senior high school students are normally distributed, and 21,000 students are surveyed, approximately how many students will there be who
have results that produce z-scores between -1 and 2?

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9