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Dice (singular: die) are typically small cubical objects marked with spots, numbers (1-6 usually) or symbols to generate random outcomes, particularly in games. Other polyhedral dice are also used in games.

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roll dice 400 times, what is the probability that the total number of dots is at least 1350?

I think your problem is that you are mixing variance and standard deviation in the NORM.DIST. You should use =1-NORMDIST(1350,1400,SQRT(1167),TRUE) in Excel, or in R: sims <- 400 mu <- 7/2 sigm …
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