Ian wants to run 412 miles to get ready for his upcoming race. he has set up 3 markers the same distance apart to show how far he has run. how far apart are the markers?

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is