Historically, the average proportion of defective bars has been 0.015. Samples will be of 100 bars each. Construct a p-chart using z = 3. What is the value of UCL?

a)	Greater than 0.060 but less than or equal to 0.070

b)	Greater than 0.050 but less than or equal to 0.060

c)	Less than or equal to 0.050

d)	Greater than 0.070