jayne the electrician charges £30 for each hour she works at a job and a callout charge of £50.jayne works n hours at a job. she charges p pounds. write down a formula for p in terms of n

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

10 points? me . its important ‼️‼️

Answer! if you don’t mind, can you explain