standard deviation

Question

The national average for mathematics

SATS in 2011 was 514. Suppose that the distribution of

scores was approximately bell-shaped and that the stan-

dard deviation was approximately 40. Within what

boundaries would you expect 68% of the scores to fall?

Answer 1

You would expect that μ±σ is the interval or [μ-σ,μ+σ] You are given these two variables.