The data set with the results of a test for 1000 students is approximated by a bell curve. The mean score was 72%. The standard deviation was 7%. Based on this information, what is the best approximation for the number of students who scored 80% or better? 16 800 309 159

Two students were asked if they liked to read. is this a good example of a statistical question? why or why not? a yes, this is a good statistical question because a variety of answers are given. b yes, this is a good statistical question because there are not a variety of answers that could be given. c no, this is not a good statistical question because there are not a variety of answers that could be given. no, this is not a good statistical question because there are a variety of answers that could be given

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

Use the given information to determine the exact trigonometric value.