Create a vector K with the following weights for $12$ individuals: $56,78,96,67,89,72,67,98,56,45,90,73$

$($a$)$ Write an R command to extract the $6^{th}$ value of the vector K $.$

$($b$)$ Write an R command to extract the first $6$ elements of the vector K $.$

$($c$)$ Write an R command to extract the last $3$ elements of the vector K $.$

$($d$)$ In this group, people whose weights exceed $80$ kg are classified as overweight. Write R commands to extract the weights of the overweight people in this group