| Question : On a scale from 0 to 100, the mean level of economic development among the countries in the world is 65 and the standard deviation is 10. What proportion of countries in the world have economic development scores above 80? Answer : To answer this, use the properties of the standard normal curve. First calculate a z-score, which is (80-65)/10 = 1.5. You can take this z-score of 1.5 and look up the area in the z-score to percentile calculator and select one-sided area. You should get about 6.6% of the countries have economic scores above 80. | How helpful was this answer?
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