Two random variables x and y are independent if the value of x does not affect the value of y. if the variables are not independent, they are dependent. a new random variable can be formed by finding the sum or difference of random variables. if a random variable x has mean mu subscript x and a random variable y has mean mu subscript y then the means of the sum and difference of the variables are given by the following equations. mu subscript x plus y baseline equals mu subscript x baseline plus mu subscript y nbsp mu subscript x minus y baseline equals mu subscript x baseline minus mu subscript y the distribution of a test's scores for college-bound male seniors has a mean of 1528 and a standard deviation of 312. the distribution of a test's scores for college-bound female seniors has a mean of 1490 and a standard deviation of 300. one male and one female are randomly selected. assume their scores are independent. what is the average sum of their scores

the answer is 31.27mph

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.

ratios represent a pattern or relationship that can be scaled.

equivalent ratios are pairs of ratios that represent the same relationship between quantities, and can be generated by multiplying or dividing both quantities in the ratio by the same factor.

in this lesson, students will use double number lines and ratio reasoning to solve ratio problems. by partitioning double number lines into proportionate intervals, students will build an understanding of equivalent ratio relationships as those that are generated by multiplying or dividing two related quantities by the same number. this lesson will build upon students' prior understanding of multiplicative comparisons, number line reasoning and equivalent fractions (while highlighting the difference between equivalent fractions and equivalent ratios); and will build toward future work in this unit on building ratio tables, and work in future grades in proportionality, scaling, and expressing and graphing linear functions.

step-by-step explanation:

ratios represent a pattern or relationship that can be scaled.

equivalent ratios are pairs of ratios that represent the same relationship between quantities, and can be generated by multiplying or dividing both quantities in the ratio by the same factor.

in this lesson, students will use double number lines and ratio reasoning to solve ratio problems. by partitioning double number lines into proportionate intervals, students will build an understanding of equivalent ratio relationships as those that are generated by multiplying or dividing two related quantities by the same number. this lesson will build upon students' prior understanding of multiplicative comparisons, number line reasoning and equivalent fractions (while highlighting the difference between equivalent fractions and equivalent ratios); and will build toward future work in this unit on building ratio tables, and work in future grades in proportionality, scaling, and expressing and graphing linear functions.