There are 20 students in class and each student was asked to give a chart for 10 different counties in the state of Texas. What is the probability that at least 25% of the counties had a chart turned in?

Iwould think that the correct answer is 8.1

You move the constant to the right side and change its sign to be 9z= -6 -8. that’s the first step.the second step would be calculate the difference of -8-6 to get -14. you equation should now be 9z=-14the last step is to divide both sides by 9 to get z=-14/9hope this