Question: I want an explanation for this example The average lifespan of a type of a deer is 10 years with a standard deviation of 3.4

I want an explanation for this example

The average lifespan of a type of a deer is 10 years with a standard deviation of 3.4 years.

Find the probability that a random sample of 36 deer will have a mean lifespan between 9 and 12 years.

Round your final answer to four decimal places.

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