Question

Let W represent the number of attempted experiments to get one experiment that is not successful.

The random variable W has a geometric distribution with mean 4 and standard deviation 3.5. Which of the following is the best interpretation of the standard deviation?

Answer 1

Values of W typically vary from 4 by about 3.5 attempted experiments, on average.

Explanation:

Answer 2

A single value randomly selected from the distribution of W will vary 4 by 3.5 attempted experiments. (collegboard)