The standard deviation of blood pressure measurements for a sample of 100 middle aged men was 17.5 mm what is a correct interpretation of this standard deviation?
1. The measurements tended to be centered around 17.5 mm
2. The width of the box in a boxplot of these measurements would be almost 17.5 mm
3. The range of blood pressure measurements was 17.5 mm
4. The typical distance blood pressure measurements fall from their mean is about 17.5 mm
Which is the correct answer, explain if possible