I need help with this

Q1) What is the total percentage return for an investor who purchased a stock for $6.23, received $1.38 in dividend payments, and sold the stock for $8.80 ? ( 2 points) Q2) A stock had the following annual returns: 03.85%,27.29%,25.87%, and 25.14%. What is the stock's: a) expected return? (1 point) What is the stock's: b) variance? (1 point) What is the stock's: c) standard deviation? (1 point) Q3) A stock has monthly returns of 01.62%,18.97%,27.45%, and 28.06%. What is the stock's geometric average return? (2 points) Q4) A stock has an expected return of 12.96% and a standard deviation of 15.72%. For this stock, what are the: a) Upper range of 68% confindence interval ( 0.5 points) b) Lower range of 68% confindence interval: ( 0.5 points) c) Upper range of 95% confindence interval: (0.5 points) d) Lower range of 95% confindence interval: (0.5 points ) e) Upper range of 99% confindence interval: ( 0.5 points) f) Lower range of 99% confindence interval: ( 0.5 points)