Find mean and standard deviation of number with vision
The probability that an individual has 20-20 vision is 0.15. in a class of 50 students, what is the mean and standard deviation of the number with 20-20 vision in the class?
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Scores on a standard test are normally, distributed with a mean of 104 and a standard deviation of 15. An individual's test score is found to be 112. Find the z-score corresponding to this value.
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Question: Identify a true statement about validity as applied to a test. Multiple choice question
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