What is the percentage of scores between -2 and +2? symmetric distribution is shown in which the area under the curve below negative 3 standard deviations is 0.1%, the area between -3 and -2 standard deviations is 2.2%, between -2 and -1 is 13.6%, between -1 standard deviations and the mean is 34.1%, between the mean and 1 standard deviation is also 34.1%, between 1 and 2 standard deviations is 13.6%, between 2 and 3 standard deviations is 2.2%, and beyond 3 standard deviations is 0.1%. a. 99.8% b. 95.4% c. 64.2% d. 47.7%