Mean Median Mode Range

Mean

The average value, calculated by adding all numbers and dividing by the total count.

Median

The middle value in a list of numbers arranged in ascending order.

Mode

The value that occurs most frequently in a data set.

Range

The difference between the highest and lowest values in a data set.

Missing-value mean problems

Multiply the mean by the number of values to find the required total, then subtract the known values to find the missing one.

Identifying Mode

Determining the most frequent value(s) in a data set, which may have one or more modes.

Calculating Median with Even Numbers

For an even number of values, the median is found by averaging the two middle numbers.

Effect of Adding a Value on Mean

Adding a new value in a data set affects the mean by changing the total sum and count.

Why is the Mean Affected by Outliers?

The mean is sensitive to extreme values, which can skew the average.

Arranging Values for Median

To find the median, all values must first be sorted in numerical order.

Mode's Multiple Occurrences

A data set may have more than one mode if multiple values occur with the highest frequency.

Calculating Range

Subtract the smallest value from the largest value in the data set.

Mean of Decimal Values

The mean can also be calculated for decimal values by summing all values and dividing by their total count.

Median in Clinical Data

Often used in clinical settings to assess the central tendency of vital signs such as pulse rates.

Understanding Statistics in TEAS

Statistics concepts like mean, median, mode, and range are vital for the TEAS 7 Math section.