pproximate percentage below. a. What is the approximate percentage of women with platelet counts within 1 standard deviation of the mean, or between 189.7 and 313.1? b. What is the approximate percentage of women with patelet counts between 128.0 and 374.87 a. Approximately % of women in this group have platelet counts within 1 standard deviation of the mean, or between 189.7 and 313. 1. (Type an integer or a decimal. Do not round.)