1. Which of the following sets of five numbers has the smallest standard deviation? Explain your reasoning, but do not do any calculations.
(a) 0, 0, 0, 10, 10 (b) 5, 5, 6, 7, 7 (c) 0, 5, 5, 5, 10
2. Which of these three sets of numbers (above) has the largest standard deviation? Explain your reasoning, but do not do any calculations.