A protein shake company Bulk Builders has been taking data on how their shake builds muscles. The data from their population is average Joe gains a =10lbs of muscle, with a standard deviation of 4 lbs. The company would like to make better claims and wants to know what the probability of getting a gain of SEM=20lbs.

You will need to find the z score but, first draw the normal curve and shade in the area that they are interested in finding.