Question

Under the normal curve, approximately what percent of scores fall between and -1 to +1 standard deviations around the mean?

Answer 1

According to the empirical rule, roughly 68% of the scores fall between z = -1 and z = 1

You can use a calculator to get a more approximate answer. If you have a TI calculator, you can use the "normalcdf" function to type in normalcdf(-1,1)