The distribution of random variable rr has mean 10 and standard deviation 4. The distribution of random variable ss has mean 7 and standard deviation 3. If rr and ss are independent, what are the mean and standard deviation of the distribution of r−sr−s ?.

Nathan is an ecologist. he’s studying the effect of secondary consumers on primary consumers. his current research focuses on a population of blue jays and crows. they eat caterpillars and mice. if the number of blue jays increases, what are the likely effects on other populations? 1the number of crows will increase. 2the number of mice will decrease. 3the number of mice will remain the same. 4the number of caterpillars will decrease.