For a normal curve, how much of the area lies within 1.5 standard deviations of the mean? I already know about the 68–95–99.7 rule, and see that it should be between 68% and 95%.Click to see full answer. In this regard, what is 1.5 standard deviations above the mean?A z-score of 1.5 is 1.5 standard deviations above and below the mean. You can also just have z-scores on one side of the mean: 1 standard deviation below the mean is a z-score of -1 and a z-score of 2.2 can be 2.2 standard deviations above the mean. A z-score of -3 is 3 standard deviations below the mean.Beside above, what percentage of data is included in +/- 1.5 sigma? Samantha Stewart. The correct answer is that 43.32 percent of data is included in +/- 1.5 Sigma, which is answer choice A. Subsequently, question is, what proportion of the data from a normal distribution is within 1.5 standard deviations of the mean? For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.What percentage of data is within 0.5 standard deviations?Reading from the chart, it can be seen that approximately 19.1% of normally distributed data is located between the mean (the peak) and 0.5 standard deviations to the right (or left) of the mean.
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