Statistics and probability

• The mean is the average value of a set of numbers.
• The mode is the most frequently occurring value in a set of data.
• The median is the middle number when all the data are arranged in size order.
• The median is the middle number when all values are arranged in ascending or descending order.
• A histogram shows how often different values occur within a continuous range, while a bar chart only shows whole numbers.
• Standard deviation measures how spread out the data points are from their mean.
• A range is the difference between the highest and lowest values in a set of data.
• Standard deviation measures how spread out the data is from its mean.
• Variance is calculated by squaring the differences between each data point and the mean, then finding their sum and dividing it by n-1.
• Range = Highest Value - Lowest Value
• Mean = sum of all observations / total number of observations
• Median = middle value
• Mean = (sum of all values) / (number of values)
• Mode = most frequently occurring value(s)