Posted by **Lisa** on Thursday, October 17, 2013 at 6:05pm.

What is the mean and standard deviation of

63.7%?

What is the mean and standard deviation of

61.4%?

Using the 68-95-99.7 rule, describe the sampling distribution of 63.7%

Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%?

Please help I am so lost...

- Statistics -
**John**, Thursday, October 17, 2013 at 6:09pm
In probability and statistics, mean is used to refer to one measure of the central tendency either of a probability distribution or of the random variable characterized by that distribution.

In statistics and probability theory, the standard deviation (represented by the Greek letter sigma, σ) shows how much variation or dispersion from the average exists. A low standard deviation indicates that the data points tend to be very close to the mean (also called expected value); a high standard deviation indicates that the data points are spread out over a large range of values.

- Statistics -
**Lisa**, Thursday, October 17, 2013 at 6:19pm
So, how would I figure out the standard deviation of 61.4?

- Statistics -
**PsyDAG**, Friday, October 18, 2013 at 7:05pm
Z score is your score in arms of standard deviations.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.6140) related to the Z score.

Are you assuming that the scores are equally distributed around the mean? Then you would want

± .307

- Statistics -
**Nadine**, Monday, October 21, 2013 at 11:23am
1. Find the area associated with this section of the curve: between z = -1.15 and z = -1.35.

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