What percentage of Weschler intelligence test scores fall between -1 standard deviation

What percentage of Weschler intelligence test scores fall between…

 

What percentage of Weschler intelligence test scores fall between -1 standard deviation (-15 pts) and +1 standard deviation (+15 pts) around the mean (100 pts)?
0.1%

  • 17%
  • 34%
  • 68%
  • 2%