Posted by **Tian** on Wednesday, January 26, 2011 at 1:17am.

From past experience it is felt that the random variable, X, the age of a mother at the birth of her first child, is normally distributed with a mean of 21.3 and a variance of 16. Find the probability that a randomly selected mother:

(a) has her first child before age 16

(b) has her first child after age 30

(c) has her first child between the ages of 15 and 20

(d) has her first child between the ages of 14 and 28

## Answer This Question

## Related Questions

- statistics - The average age of statistics students nationwide is 22. The ...
- statistics - 1. If we select a birth at randam, what is the probability the ...
- statistics - Let X be the average of a sample of size 25 independent normal ...
- Statistics - Suppose X is a normally distributed random variable with the mean u...
- Statistics - X is a normally distributed random variable X with mean 15 and ...
- probability - A fair coin is flipped independently until the first Heads is ...
- statistics - At a large publishing company, the mean age of proofreaders is 36.2...
- Statistics - If the population is normally distribution then the sample must be ...
- Statistics - M/C - 14. The marks on a statistics test are normally distributed ...
- statistics - Womenâ€™s heights are normally distributed with a mean of 162 cm and ...

More Related Questions