Question
What z-score values form the boundaries for the middle 60% of a normal distribution? ​
  a.
z = +0.84 and z = –0.84
  b.
z = +0.39 and z = –0.39
  c.
z = +0.25 and z = –0.25
  d.
z = +0.52 and z = –0.52

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