1. Why is standard deviation considered one of the best measures for determining variation among data?

2. A nutritionist obtains the amounts of sugar (grams) of 10 different cereals, including Cheerios, Corn Flakes, Froot Loops and seven others. The amounts are as follows: 3, 24, 30, 47, 43, 7, 47, 13, 44, 39. What is the standard deviation of the amount of sugar in the cereal consumed by the population of all Puerto Ricans who eat cereal (Triola, 2004).

3. The monthly salary of five (5) employees of a pharmaceutical company was as follows: $3,667, $4,935, $3,876, $4,700 and $3,178. What should be the value of the standard deviation for these data?