medium · GRE Quant
Parcel masses in a last-mile logistics sample are normally distributed with mean 4.0 kg and standard deviation 0.5 kg. Use the approximation that each mean-to-one-standard-deviation band contains 34%, each one-to-two-standard-deviation band contains 14%, and each tail beyond two standard deviations contains 2%. Approximately what percent of the parcel masses are below 3.5 kg?
- 2%
- 14%
- 16%
- 34%
- 50%
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