A new industrial oven has just been installed at Piatt Bakery. To develop experience regarding the oven temperature, an inspector reads the temperature at four different places inside the oven each half hour starting at 8:00 a.m. The last reading was at 10:30 a.m., for a total of six samples. The first reading, taken at 8:00 a.m., was 349 degrees Fahrenheit. (Only the last two digits are given in the following table to make the computations easier.)


Reading
Time 1 2 3 4
8:00 a.m. 49 47 53 50
8:30 a.m. 48 33 41 63
9:00 a.m. 51 47 49 54
9:30 a.m. 51 40 53 48
10:00 a.m. 55 51 52 49
10:30 a.m. 46 53 40 46