Answer the plz i will name you the brainliest

Which graph shows a function with a range of all real numbers greater than or equal to -1

Little’s law firm has just one lawyer. customers arrive randomly at an average rate of 6 per 8 hour workday. service times have a mean of 50 minutes and a standard deviation of 20 minutes. how long does a customer spend at little’s law firm on average?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much