I need help with my math, is there anyone one that would be willing to do a zoom to help me?

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?

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?