$1.$ what is the difference between beta and standard deviation?

$2.$ If the market risk premium of a share is $7\%,$ the risk free rate is $5\%$ and the Beta is $2,$ calculate the expected return.

$3.$ If the expected return of a stock is $10\%$ and the standard deviation is $5\%,$ calculate the confidence interval that provides a $95\%$ probability..