please show how you get the standard deviation in R if possible

Some frozen food dinners were randomly selected from this week's production and destroyed in order to measure their actual calorie content. The claimed calorie content is 200. Here are the calorie counts for each frozen dinner selected: 200 191 214 201 211 197 205 209 210 201 187 210 Assume the distribution of calories is normal. (a) The test statistic (z/t) is . Use two decimals. (b) Does the sample indicate that the mean calorie content is 200? Set a = 0.04. ? 4 (c) Find the P-value of the test in (a)-(b)