– How is probability defined? The probability of a success is defined as the number of successes divided by the total.

– What is standard deviation? Standard deviation measures the spread of the data.

– Median: middle number Locating the median-when n (the number of elements is odd), the median is located at the (n+1)/2 number. When n is even, the median is the average of the (n/2) and ((n/2)+1) numbers.

– Mode: most frequent/repeated number

– Range: Largest number-smallest number

– Mean: AVERAGE=sum/n