Question: Create a new variable in R which contains the difference between the mean chart position of albums before 2000, and the mean chart position of

Create a new variable in R which contains the difference between the mean chart position of albums before 2000, and the mean chart position of albums released in 2000 or later. What is this mean difference? Question 4 options: 1.43 -1.43 2.86 -2.86

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