List data set & question: List the data set and understand what is being asked.The data set given is: 3,8,−1,4,9,−4,−7,4. We are asked to find the mean (average) of these numbers.
Find sum of numbers: Add up all the numbers in the data set to find the sum.Sum = 3+8+(-1)+4+9+(-4)+(-7)+4Sum = 3+8−1+4+9−4−7+4Sum = 16
Count values in data set: Count the number of values in the data set.There are 8 numbers in the data set.
Calculate mean: Divide the sum of the data set by the number of values to find the mean.Mean = Number of valuesSumMean = 816Mean = 2