About 68 percent of a normal distribution lies within one standard deviation of the mean and about 95 percent within two. About what percent lies between the first and second standard deviations, counting both sides?

1. The band out to two standard deviations holds about 95 percent of the values. 2. The band out to one standard deviation holds about 68 percent. 3. The strip between them is the larger band with the inner band taken out. 4. Subtracting gives 95 minus 68. 5. That difference is about 27 percent. 6. The figure covers both sides of the mean at once, so it should not be halved or doubled. 7. The answer of about 13 percent is one side only, which halves the correct value. 8. The answer of about 34 percent is the stretch from the mean out to one standard deviation. _Source: OpenStax High School Statistics (CC BY 4.0), section 6.1 The Standard Normal Distribution_