# How many standard deviations is 99th percentile?

## 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.

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