Asap or when any one can the life spans of gorillas in a particular zoo are normally distributed. the average gorilla lives 20 years with a standard deviation of 2.1 years. find a range of gorillas' life spans which lies within 2 standard deviation, about 95% between 15.8 and 24.2 years between 17.9 and 22.1 years between 13.7 and 26.3 years between 13.7 and 22.1 years