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can someone help pls thank you! Volatility is an important input in option valuation, but it is not an observed variable and must be estimated.

can someone help pls thank you!
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Volatility is an important input in option valuation, but it is not an observed variable and must be estimated. It can be estimated using historical data. Alternatively, since option prices can be observed, we can use the observed option price together with other market data to imply volatility. This volatility can then be used to value other options. Suppose an American put option written on the Russell 2000 index with an exercise price of 2,150 and a time-to-maturity of 15 months is currently trading at $354.8354. The interest rate and dividend yield are 2.75% and 1.95% respectively (both continuously compounded). The current index level is 2,050. Use a three-step tree to imply the volatility. (Hint: set up the tree in a spreadsheet and find the implied volatility by Solver.) In the same set-up as above, suppose everything remains the same except that someone has already estimated the volatility to be 30.5%, and the American put is worth $342.7944. What is the implied dividend yield

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