Statistical Analysis (Normal Distribution)

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Bass: The bass in Clear Lake have weights that are normally distributed with a mean of 2.6 pounds and a standard deviation of 0.9 pounds.

(a) Suppose you only want to keep fish that are in the top 20% as far as weight is concerned. What is the minimum weight of a keeper? Round your answer to 2 decimal places. 

(b) Suppose you want to mount a fish if it is in the top 0.5% of those in the lake. What is the minimum weight of a bass to be mounted? Round your answer to 2 decimal places. 

Oct 26th, 2015

Thank you for the opportunity to help you with your question!

We have the mean ,m=2.6 and standard deviation ,d=0.9

a)We have to find the minimum value of x  such that P(x<k)=.8

So the z score corresponding to probability=0.8,from the normal distribution table is .8416



(x-2.6)/.9 =.8416


b)The top .5% means the minimum value is the maximum for the probability value 1-.5% =.995


The z score=2.5758


(x-2.6)/.9 =2.5758

x=4.92(answer)=>MInimum weight

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 26th, 2015

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