ANSWER THIS QUESTION PLEASE!!

Part 5. Code to calculate SD (long answer; 6 points) An imaginary dataframe named dfr contains a vector named heart . rate. In the box below, write R code to perform the following operations: 1. Extract the vector heart . rate from the dataframe and assign the vector to a new object called hr. 2. Calculate the standard deviation of hr, outputting the results to the R console. Do NOT provide the results of the calculation. Only provide the code needed to perform the calculation. 3. Generate a density histogram of hr. You do NOT need to provide the histogram itself. Only provide the code needed to generate the histogram. To get full credit, your code: must perform the operations described. must be free of errors. must adhere to the coding conventions explained in class. must NOT include a file header/footer, section headers, comments/descriptions or anything else. Only include the code needed to perform the operations described. must be comprised of exactly 3 lines, corresponding to the three (3) steps outlined above