Suppose f(x) = 1/4 over the range a ≤ x ≤ b,and suppose P(X > 4) = 1/2.What are the values for a and b?

A) 0 and 4
B) 2 and 6
C) Can be any range of x values whose length (b − a) equals 4.
D) Cannot answer with the information given.

Statistical process control (SPC) methodology was developed to monitor, control, and improve products and services.