The percentage of families with a monthly income of 1,000 or more in city a and city b is 25% and 20% respectively. If a random sample of 100 families is selected from each of these two cities and the proportion of families earning rs. 1,000 or more in the two samples are compared, what is the probability that the city a sample proportion will be greater than that of city b's by 3% or more?

Find an equation in standard form of the parabola that passes through (-2, 9), (-4, 5), and (1, 0)

What are the two main purposes of edgar allen poe’s, “the masque of the red death? ”

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.