Question

A soft drink vending machine is supposed to fill cups with pop. The cups hold exactly 8 oz of liquid. Suppose the actual amount dispensed by the machine follows a normal distribution with mean 7 oz. If it is found that exactly 4 percent of the cups overflow, what is the standard deviation of the normal distribution??

omg, please help.

Answer 1

does this formula look familar?

z= (x-mean)/(standard deviation)

Find the z-score that matches 4%. Then, plug in that for z. Finally, solve for standard deviation.