Compute, based on the available data:

$-$The mean $(\backslash$mu $)$ and standard deviation $(\backslash$sigma $)$ of the monthly percentual change in the spot rate over June $1$st $2021$ June $1$st $2022$

$-$The expected July $1$st spot rate

$-$A $95\%$ confidence interval for the July $1$st spot rate