1.Given the data: 42, 55, 57, 60, 68, 70, 72, 80. Find the standard deviation. Round the final answer to the nearest hundredth.

2. (10 points) In the last election, County A, County B, and County C had 4000, 8000, and 9000 registered voters, and 55%, 50%, and 30% of the registered voters voted in these three counties, respectively. What was the average percentage of registered voters who voted in the three counties combined?