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Normal Probability: English Scores

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Scores are normally distributed with a mean of 70 and a standard deviation of 10. The school has decided to place the top 25% into honors English and the bottom 20% into remedial English. What scores separate the upper 25% and lower 20% of the students from the rest? Please explain with solution.

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The solution provides step by step method for the calculation of probability using the Z score. Formula for the calculation and Interpretations of the results are also included.

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Normal distribution
Scores are normally distributed with a mean of 70 and a standard deviation of 10. The school has decided to place the top 25% into honours English and the bottom 20% into remedial English. What scores separate the upper 25% and lower 20% of the students from the rest? Please explain ...

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