Hi all I'm currently taking Statistics 1 and I'm stuck on a homework problem that I've been trying to figure out for a while...hopefully one of you guys can enlighten me on how to do it..heres the question:
The following data represent the scores of a sample of 50 students on a statistics exam. The mean score is x bar = 80.3 and the standard deviation is s = 11.37.
49 51 59 63 66 68 68 69 70 71
71 71 73 74 76 76 76 77 78 79
79 79 79 80 80 82 83 83 83 85
85 86 86 88 88 88 88 89 89 89
90 91 92 92 93 95 96 97 97 98
What percentage of the scores fall in each of the intervals ± s, ± 2s, and ± 3s? Based on these percentages, do you believe that the distribution of scores is approximately normal? Explain.
Any help will be greatly appreciated. Thanks
The following data represent the scores of a sample of 50 students on a statistics exam. The mean score is x bar = 80.3 and the standard deviation is s = 11.37.
49 51 59 63 66 68 68 69 70 71
71 71 73 74 76 76 76 77 78 79
79 79 79 80 80 82 83 83 83 85
85 86 86 88 88 88 88 89 89 89
90 91 92 92 93 95 96 97 97 98
What percentage of the scores fall in each of the intervals ± s, ± 2s, and ± 3s? Based on these percentages, do you believe that the distribution of scores is approximately normal? Explain.
Any help will be greatly appreciated. Thanks