I got Mean: 3 Variance: 2.67 S.D.: 1.55 am I on the right track, also how would I work through number 4?

Exercise 11-8. Table 11-5 reports the number treating these data as the population of all U.S. of nuclear power plants in U.S. states. states with nuclear power plants: Table 11-5 1. Mean State Nuclear Power Plants Connecticut Florida w Illinois 2. Variance Michigan W Mississippi New Jersey W Ohio UI N Pennsylvania 3. Standard deviation South Carolina Virginia N Source: Data are from NBC News, 4. Interpret the mean and standard deviation https://www.nbcnews.com/businessmain/10- in a single sentence that describes the states-run-nuclear-power-169050. nuclear power plant data. Compute the following descriptive statistics