Normal Probability
Finding the Cumulative Probability
- Let’s
suppose that I am trying to find the probability that a X<=90 when you
have a Normal Distribution with mean 100 and standard deviation 6.
- First
enter X into a column.
- Go
to Calc, Probability Distributions, Normal.
- The
screen below will appear.
- Notice
that I have entered 100 as the mean and 6 as the standard deviation.
- If
you do not enter a column into the Optional Storage blank, Minitab will display
the answer in the session window.
Cumulative Distribution Function
Normal with mean = 100 and standard
deviation = 6
x P( X <= x )
90
0.0477904
Finding
the value of x such that 90% of the data is less than that value
1.
Let’s suppose that I am trying to find the value
of x such that 90% of the data is less than that value when you have a Normal
Distribution with mean 100 and standard deviation 6.
2. First
enter the probability into a column.
3. Go
to Calc, Probability Distributions, Normal.
4. The
screen below will appear.
5. Notice
that I have entered 100 as the mean and 6 as the standard deviation.
6. If
you do not enter a column into the Optional Storage blank, Minitab will display
the answer in the session window.
Inverse Cumulative Distribution Function
Normal with mean = 100 and
standard deviation = 6
P( X <= x ) x
0.9 107.689