# How many people are within 1 standard deviation of the mean?

## How many people are within 1 standard deviation of the mean?

For a standard bell curve the population within one standard deviation of the mean is 68.2%.

## What does 1 standard deviations mean?

What does 1 SD (one standard deviation) mean. On a bell curve or normal distribution of data. 1 SD = 1 Standard deviation = 68% of the scores or data values is roughly filling the area of a bell curve from a 13 of the way down the y axis.

**What percent of people score between and 1 standard deviation from the mean?**

Fun fact: the percentage of our distribution that falls in a given area is exactly the same as the probability that any single observation will fall in that area. In other words, we know that approximately 34 percent of our data will fall between the mean and one standard deviation above the mean.

### How many standard deviations from the mean is 99%?

99% of the population is within 2 1/2 standard deviations of the mean. 99.7% of the population is within 3 standard deviations of the mean. 99.9% of the population is within 4 standard deviations of the mean.

### What percentage of the population is 4 standard deviations?

Around 0.1% of the population is 4 standard deviations from the mean, the geniuses.

**How much percent is 2 standard deviations?**

about 95%;

For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.

#### Can standard deviation be a percentage?

The relative standard deviation (RSD) is often times more convenient. It is expressed in percent and is obtained by multiplying the standard deviation by 100 and dividing this product by the average. Example: Here are 4 measurements: 51.3, 55.6, 49.9 and 52.0.

#### Is a standard deviation of 1 high?

The higher the CV, the higher the standard deviation relative to the mean. In general, a CV value greater than 1 is often considered high.

**How do you find the percentage of data in one standard deviation of the mean?**

Percent Deviation From a Known Standard To find this type of percent deviation, subtract the known value from the mean, divide the result by the known value and multiply by 100.

## What percentage of cases fall between 1 and 1 standard deviation in the normalized distribution?

68%

In general, about 68% of the area under a normal distribution curve lies within one standard deviation of the mean.