At a large university, data were collected on the number of sisters and brothers that each student had. let the random variable x x represent the number of sisters and the random variable y y represent the number of brothers. the distribution of x x has mean 1.00 and standard deviation 0.94. the distribution of y y has mean 1.07 and standard deviation 1.04. what is the mean of the distribution of x+y x + y ?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

What is the graph of the absolute value equation ? y=|x|-5