3. Describing Data Numerically

Find the standard deviation of the sample below. Round your answer to the nearest tenth.

Which of the following best describes the relationship between the $standarddeviation$ and the $precision$ of a procedure?

If a distribution has zero variance, which of the following statements is true about the data values? $\mathrm{Var}\left(X\right)=0$

Suppose the birth weights of newborns in a population are normally distributed with a mean of $3.5$ kg and a standard deviation of $0.5$ kg. What is the z-score of a newborn who weighs $4$ kg?