standard deviation

  1. DrPettans

    statistics: standard deviation normal curve

    In a normal distribution curve, what percent of the cases are ABOVE 1 standard deviation BELOW the mean?? The book says it's 84% but I do not understand why. I'd have answered 34% based on this knowledge: within 1SD there's 68% of the cases (34% are -1SD + 34% that are +1SD) within 2 SD there's...