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Posted: September 28th, 2023
A cut-off score of 79 has been established for a sample of
A) A cut-off score of 79 has been established for a sample of scores in which the mean is 65. If the corresponding z-score is 1.4 and the scores are normally distributed, what is the standard deviation?B) The standard deviation of a normal distribution is 12 and 90% of the values are greater than 6. What is the value of the mean?C) The mean of a normal distribution is 132, and only 5% of the values are greater than 155. What is the standard deviation?
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