# How many standard deviations is 99th percentile?

2.

## What does two standard deviations above the mean mean?

Data that is two standard deviations below the mean will have a z-score of -2, data that is two standard deviations above the mean will have a z-score of +2. Data beyond two standard deviations away from the mean will have z-scores beyond -2 or 2.

## Is one standard deviation above the mean an A?

The standard normal distribution is a normal distribution with a mean of zero and standard deviation of 1. ... Examine the table and note that a "Z" score of 0.

## Can 2 sets of data have the same mean but a different SD?

Yes, absolutely! Both the median and mean are measures of “central tendency”, whereas the standard deviation measures spread around this measure. So yes, it's definitely possible to have the same mean/median but completely different spreads around this.

## Can two samples have the same range?

Could two samples have the same mean but different ranges? ... Yes, the mean does not reflect the distribution of numbers.

## Is it possible for two or more sets of values to have the same standard deviation and variance?

It is possible for two or more sets of values to have the same standard deviation and variance. ... The range is equal to the square of the variance. The variance is equal to the square of standard deviation. The standard deviation is equal to the square of the variance.

## Can a data set have the same mean median and mode?

A data set can have the same mean, median, and mode. When each data class has the same frequency, the distribution is symmetric.