Posted by **luke** on Thursday, April 25, 2013 at 3:28pm.

All deal with a random variable X that follows a normal probability distribution with mean equal to 37 and a standard deviation of 5.

Compute P(X < 39)

Compute P(X < 29 or X > 41)

Compute P(X > 30)

Find the 42nd percentile for this distribution.

- statistics -
**PsyDAG**, Friday, April 26, 2013 at 2:51pm
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.

*Either-or* probabilities are found by adding the individual probabilities.

For last Q, Start with table (.42) and insert Z score into above equation.

- statistics -
**luke**, Friday, April 26, 2013 at 9:30pm
PsyDAG, right on thanks

## Answer This Question

## Related Questions

- statistics - All deal with a random variable X that follows a normal probability...
- Math - Suppose a baseball player had 211 hits in a season. In the given ...
- probability - A random experiment of tossing a die twice is performed. Random ...
- Statistics - The monthly incomes from a random sample of workers in a factory ...
- math - The weights (in pounds) of a sample of five boxes being sent by UPS are: ...
- statistics - 1. The exam scores for the students in an introductory statistics ...
- math - let the random variable x denote the number of girls in a five-child ...
- RES342 - A normal distribution has a mean of 80 and a standard deviation of 14. ...
- statistics - Let x be a continuous random variable that is normally distributed ...
- Statistics - Suppose that the probability distribution of a random variable x ...

More Related Questions