8. Suppose that 90% of the student taking statistics past the course.
What is the probability at least 2 students in a class of 20 will fail the course?
b. Find the mean, variance, and standard deviations of the number of students who
failed the course.

Which two statements are true about a system? 1. a system is a group of objects analyzed as one unit. 2. energy that moves across system boundaries is conserved. 3. there’s only one way to define the boundaries of a system. 4. all systems are made by humans.

Explain how you might determine the rate of weathering on a sample rock

Which food would provide you with the most calcium?