Commands needed in R language? Answered

Hello everyone
I hope that you are fine. Because I am starter, I am facing difficulties in figuring out commands that do the following:

Find the sample mean M and sample standard deviation S
Build the histogram.
Find if the shape of the distribution is close to normal or not.
Add to the histogram plot the line corresponding to the probability density function of the normal distribution using obtained mean and standard deviation.
Set up a 95% CI for the sample mean, using your values of M,S and N

Use the temperature (tempc and tempf) data given in the excel sheet. You can download the excel sheet from following link:
https://app.box.com/s/8uw6os46iibmx4n5t21q

Kind Regards
raishikoh