The following data set gives the scores of 50 students of an engineering exam. The results are shown below. Test at the 1% level of significance that these data follow a normal distribution.
79 81 82 74 86 92 95 87 70 78
79 88 89 85 87 92 96 91 83 83
77 76 84 87 88 91 90 92 94 96
94 91 90 77 81 76 78 83 85 87
80 87 86 85 84 86 88 86 87 85