Explain random variable of approximately normal distribution

Reference no: EM13137710

The average age of trees in a large local park is 60 years with a standard deviation of 2.2 years. A simple random sample of 400 trees is selected, and the sample mean age of these trees is computed.

We know the random variable has an approximately normal distribution because of

a. the law of large numbers.
b. the central limit theorem.
c. the 68-95-99.7 rule.
d. the fact that probability is the long-run proportion of times an event occurs.

Reference no: EM13137710

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