Can you help me determine what type of test/technique to do to solve the below questions?

The irradiation of food to destroy bacteria is a growing phenomenon. In order to determine which one of two methods of irradiation is best, a scientist took a random sample of 100 one- pound packages of minced meat and subjected 50 of them to irradiation Method 1 and the remaining 50 to irradiation Method 2. The bacteria count was measured and the following statistics were computed.The scientist noted that the data are normally distributed.