This is the most popular Probability Distribution.

Probability Distribution curve, also called as Bell-Shaped curve.

Probability is calculated as an area under the curve to the left of a certain z-value P(z < k),

to the right of z P(z > k) or between different values of z P(k1 < z < k2).

z-value is calculated based on mean and standard deviation :

z = (x -)/

Keep in mind:

total area under the curve = 1

P(z > k) = 1 - P(z < k)

Select your own values of z1 and z2,

each between -3.00 and +3.00

Then find :

1) P(z < z1)

2) P(z > z1)

3)P(z < z2)

4 )P(z > z2)

5) P(z1 < z < z2)