After many years of teaching, a statistics professor computed the variance of the marks on her final exam and found it to be σ2 = 250. she recently made changes to the way in which the final exam is marked and wondered whether this would result in a reduction in the variance. a random sample of this year’s final exam marks are listed here. can the professor infer at the 10% significance level that the variance has decreased?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

For this option, you will work individually. the pythagorean theorem can be used in many real-world scenarios. part 1 write your own real-world scenario where the pythagorean theorem can be applied to find a missing piece. you may choose to write a problem that is two- or three-dimensional in nature. be sure that you will be able to draw a diagram of your scenario. write out your problem and submit it for part 1. be sure to end your scenario with a question. part 2 draw a diagram of the scenario you created in part 1. you may draw by hand and scan and upload your drawing or create a computer-generated drawing for submission. be sure to label all parts and dimensions of the drawing. part 3 solve the question that you posed in part 1. show all of your steps in answering the question. for this option, you will need to submit all three parts for full credit—your real-world problem and question, the diagram that you created, and your work solving the problem, showing all steps. * note that your instructor is looking for your own original idea. while it is acceptable to use the internet for research and inspiration, academic integrity policies apply.

What is the result of adding the system of equations? 2x+y=4 3x-y=6