1. What is the probability of a decrease in sales if we increase the price?

2. How likely is it that the new method will increase productivity?

3. How likely is the project to be completed on time?

4.Given that z is a standard normal random variable, determine:

a. P(z < 1.20)

b. P(z 0.71)

c. P(0.52 z 1.22)

d. The value of z if the area to the left of z is 0.6700.

Note: Use the Z table of the standard normal distribution