You have the following information about means and standard deviations of several investment options ...

  

You have the following information about means and standard deviations of several investment options:

  

Investment

Mean

StDev

 

A

13

19

 

B

12

18

 

C

8

20

Your client wants to minimize the chance of having a less than 0% return. What is the safety first ratio of the optimal investment for the client?

Enter answer accurate to three decimal places.