Question 7 You are interested to buy and "hod!' (holding for dear life) bitcoin. Based on bitcoin closing price for each year, please calculate bitcoin average yearly returns by using natural log retum, i.e, retum = ln (P. P.-1) as well as historical volatility. Year USD Ln retum (Return ; - average return)? 2010 0.30 2011 4.72 2012 13.51 2013 726.33 2014 309.69 2015 424.44 2016 963.98 2017 13438.56 2018 3750.20 Average annual retum = Bitcoin historical volatility (standard deviation) =