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• Normal distribution is a
  probability distribution
  that plots all of its
  values in a symmetrical
  fashion and most of the
  results are
  situated around the
  probability's mean.
• It      is      graphically
  represented        by     a
  symmetrical bell- shaped
  curve that known as the
  normal curve.
• The curve concentrated
  in the center and
  decreases on either side.
  This means that the data
  has less of a tendency to
  produce unusually
  extreme values, compared
  to some other
  distributions.
• The bell shaped curve is
  symmetric. This tells you
  that the probability of
  deviations from the mean
  is comparable in either
  direction.
• The standard score is
  the distance of the
  score from the mean
  in terms of the
  standard deviations
  the observed value lies
  above or below the
  mean of the
  distributions.
• Frequencies of scores
  in distributions can be
  found using the normal
  curve. Several
  problems on the
  different fields can
  be solved by applying
  the normal curve.
Find the z- score of 80



 z = - 1.33
  = 0.4082 (tabular)
0.50 – 0.4082
= 0.0918 or 9.18%
Normal distribution

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Normal distribution

  • 1.
  • 2.
  • 3. • Normal distribution is a probability distribution that plots all of its values in a symmetrical fashion and most of the results are situated around the probability's mean. • It is graphically represented by a symmetrical bell- shaped curve that known as the normal curve.
  • 4. • The curve concentrated in the center and decreases on either side. This means that the data has less of a tendency to produce unusually extreme values, compared to some other distributions. • The bell shaped curve is symmetric. This tells you that the probability of deviations from the mean is comparable in either direction.
  • 5.
  • 6. • The standard score is the distance of the score from the mean in terms of the standard deviations the observed value lies above or below the mean of the distributions.
  • 7. • Frequencies of scores in distributions can be found using the normal curve. Several problems on the different fields can be solved by applying the normal curve.
  • 8.
  • 9. Find the z- score of 80 z = - 1.33 = 0.4082 (tabular)
  • 10. 0.50 – 0.4082 = 0.0918 or 9.18%