The score for an IQ test is approximately normal with a mean of 100 with standard deviation 15. An organization calls itself high IQ society when the score is 130 or higher. What percent qualifies for this membership?
The score for an IQ test is approximately normal with a mean of 100 with standard deviation 15. An organization calls itself high IQ society when the score is 130 or higher. What percent qualifies for this membership?
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The average playing time of mp3 songs is 35 minutes with standard deviation of 5 minutes. If the distribution is normal, what is the proportion that the playing time is longer than 50 minutes?
What is the probability that the score is lower than 75 points when the test score is normally distributed with a mean of 82 points and standard deviation of 9?
How many percent falls on 2 standard deviation from the mean of a normal distribution?
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