heights in the 20-29 age group were normally distributed

mean= 69.8 inches

standard deviation =3.0 inches

1) what's the probability a height that is less than 66 inches.

2) What's the probability a height that is between 69 and 73 inches.

3) What's the probability a height that is more than 73 inches.

4) Is there any unusual events?

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