📊 R Programming
Q. In dplyr, how do you calculate the sum and mean of a numeric variable named quantity for each group?
  • (A) summarize(total = sum(quantity), average = mean(quantity))
  • (B) calculate(sum = sum(quantity), mean = mean(quantity))
  • (C) summarize(sum_quantity = sum(quantity), mean_quantity = mean(quantity))
  • (D) total_mean(quantity)
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✅ Correct Answer: (A) summarize(total = sum(quantity), average = mean(quantity))

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