The manager of a grocery store has taken a random sample of 40 customers. the average length of time it took the customers in the sample to check out was 3.1 minutes with a variance of 0.55 minutes. we want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.

Click on the y intercept. -x +4 i know you cant click on it so could you just say the coordinates like (example - (1,0) you so much.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?