What is the mean of this data 64 80 64 70 76 79 67 72 65 73 68 65 67 65 70 62 67 68 65 64?

To find the mean of the data set, first sum all the values: 64 + 80 + 64 + 70 + 76 + 79 + 67 + 72 + 65 + 73 + 68 + 65 + 67 + 65 + 70 + 62 + 67 + 68 + 65 + 64 = 1395. Then, divide the total by the number of values, which is 20. Thus, the mean is 1395 / 20 = 69.75.