In a neighborhood donut shop, One type of donut has 490 calories, Three types of donuts have 520 calories, Three types of donuts have 360 calories, five types of donuts have 350 calories, and four types of donuts have 390 calories.
Find the standard deviation round answer to the nearest 10th
Here's a very good article from Khan Academy that you can learn from: https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/a/calculating-standard-deviation-step-by-step