Bigger animals tend to carry their young longer before birth. The length of hors

Bigger animals tend to carry their young longer before birth. The length of horse pregnancies from the conception to birth varies according to a roughly normal distribution with mean 336 days and standard deviation 3 days. Use the 68-95-99.7 rule to answer these questions. 
The lengths of the middle 95% of all horse pregnancies fall between blank and blank. What percent of horse pregnancies are less than 333 days?

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