![]() ![]() Around 99.7% of scores are between 20 and 80.Around 95% of scores are between 30 and 70.Around 68% of scores are between 40 and 60.The data follows a normal distribution with a mean score of 50 and a standard deviation of 10. ![]() Around 99.7% of scores are within 3 standard deviations of the mean.Įxample: Standard deviation in a normal distributionYou administer a memory recall test to a group of students.Around 95% of scores are within 2 standard deviations of the mean,. ![]() ![]()
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