Extracting vectors from data frames (dplyr)

Using the Portal data surveys table (download a copy if it’s not in your working directory):

  1. Use $ to extract the weight column into a vector
  2. Use [] to extract the month column into a vector
  3. Extract the hindfoot_length column into a vector and calculate the mean hindfoot length ignoring null values.
Expected outputs for Extracting vectors from data frames: 1