Lesson 9.1- Measures of Center and Spread

Front

What is the mean?

Back

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

Front

How do you calculate the average points scored per game?

Back

To calculate the average points scored per game, sum all the points scored and divide by the number of games played.

Front

What is the mean of the following test scores: 68, 52, 83, 91, 80?

Back

The mean is 74.8.

Front

What is the upper quartile (Q3)?

Back

The upper quartile (Q3) is the median of the upper half of a data set, representing the 75th percentile.

Front

How do you find the mean and median of a data set?

Back

To find the mean, add all values and divide by the number of values. To find the median, arrange the values in order and find the middle value.

Front

What is the median?

Back

The median is the middle value of a data set when arranged in ascending order.

Front

What does it mean if a data set has a high spread?

Back

A high spread indicates that the values in the data set are widely dispersed from the mean.

Front

What is the difference between mean and median?

Back

The mean is the average of all values, while the median is the middle value when the data is sorted.

Front

How do you find the lower quartile (Q1)?

Back

The lower quartile (Q1) is the median of the lower half of a data set, representing the 25th percentile.

Front

What is a data set?

Back

A data set is a collection of related data points or values.