can I know how to calculate this in R Studios

The NewYork Time reported that the average time to download the homepage from the Internal Revenue Service website www.irls.com was 0.8 seconds. Suppose that the download time was normally distributed with a standard deviation of 0.2 seconds. If random samples of 30 download times are selected, determine
a. the standard error of the mean
b. the probability of the mean time is less than 0.75 seconds
c. the probability of the mean time is between 0.70 and 0.90 seconds

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