What is the expected value of an original investment of $3,000 that has a 10% chance of ending up with a value of $2,000, an 80% chance of ending up with a trade value of $3,500, anda 10% chance of ending up with a value of $4,000 a. $6,000 b. $3,500 c. $3,400 d. $3,250 e. $3,000

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this