4. Wagya beef is a highly prized meat, and its fat content should be well above 2U percent. A beef supplier received complaints that the fat content in its Wugyu beef do not follow the standards. The supplier submitted 12 random samples of Wagyn beef pieces to an independent laboratory for analysis and the percentage of fat in each of the meat is as follows: mmmmwwammwmw Assuming that the percentage of fat content in the meat is normally distributed with an unknown standard deviation. Is there any evidence that the complaints are justied at 5% level of signicance? :5. rel-am 'e 'u'i..-'i1'|rlo'-r--'<