Question

he annual precipitation for one city is normally distributed with a mean of 399 inches and a standard deviation of 3.3 inches. In what percentage of years is precipitation in the city between 392.4 inches and 405.6 inches?
Hard help?

Answer 1

you can use the same website I gave you in a previous post to answer your last two questions

this time use "area from a value" and enter the values in "between"