help please

13. [40.16 Points] DETAILS BBUNDERSTAT12 6.3.0275. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Thickness measurements of ancient prehistoric Native American pot shards discovered in a Hopi village are approximately normally distributed, with a mean of 4.8 millimeters {mm} and a standard deviation of 1.5 mm. For a randomly found shard, find the following probabilities. (Round your answers to four decimal places.) I USE SALT {a} the thickness is less than 3.0 mm {bl the thickness is more than 7.0 mm {c} the thickness is between 3.0 mm and 7.0 mm Need Help