Final answer:
The mean of the set of data 80 80 80 80 80 is 80, and the sample standard deviation is 0.
Step-by-step explanation:
To find the mean of a set of data, you need to add up all the values and divide by the total number of values in the set. For example, for the set of data 80 80 80 80 80, the mean is (80 + 80 + 80 + 80 + 80) / 5 = 400 / 5 = 80.
To find the sample standard deviation, you need to calculate the differences between each value and the mean, square each difference, calculate the mean of those squared differences, and then take the square root of that mean. For the set of data 80 80 80 80 80, the differences from the mean are 0 0 0 0 0. Squaring each difference gives you 0 0 0 0 0. Taking the mean of those squared differences gives you (0 + 0 + 0 + 0 + 0) / 5 = 0. Finally, taking the square root of the mean gives you √0 = 0. Therefore, the sample standard deviation is 0.