Finding a % with Mean and Standard Deviation

Question

Manbir is a local fisherwoman who has been recording the mean weight of the fish that she catches. She discovered that the distribution of weight is normal with a mean of 2.9kg and a standard deviation of .45.

 

a. what % of fish weighed under 2.1kg

b. what is the probability of fish weighed between 1.8 and 4kg

Answer 1

 

 

 

           (2.90-.45) 2.45------------------------------------2.9 (mean)--------------------------3.35(2.90+.45)