Write an R command that calculate ΣΣ 8 9 i2 7 + 4j i=1 j=2

Write an R command that calculate ΣΣ 8 9 i2 7 + 4j i=1 j=2 Problem 3: Write an R function named mad (for mean absolute deviation) with a single argument x that calculates n lai – ū i=1 where ū is the sample mean, and T = -1 (1) is a column) vector.

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