An iPod battery is supposed to provide 3.7 volts. An aftermarket supplier manufactures 5,000 replacement batteries and

Question:

An iPod battery is supposed to provide 3.7 volts. An aftermarket supplier manufactures 5,000 replacement batteries and finds that they have a mean of 3.7 V, but about half of the batteries have less than 3.7 volts and half have more than 3.7 volts. Does the error appear to be random or systematic? Explain.