Human body temperatures are normally distributed with a mean of 98.3℉ and a standard deviation of 0.59℉. If 20 people are randomly selected, find the probability that their mean body temperature will be less than 98.5℉. Round to four decimal places.

Organisms that live in the alpine and taiga biomes have developed unique adaptations that aid in their survival. the douglas-fir is a conifer tree that grows in the taiga biome. it has an average height of about 70 feet, and its wood is an important source of lumber.

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

Need solving this second acceleration problem.