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Find the probability that a student scores

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Reference no: EM131429684

Suppose the average value on the final exam is 78% with a standard deviaton of 10%. Assume the exam scores are normally distributed.

1) Referring to Final Exam, find the probability that a student scores between 70% and 85%.

2) Referring to Final Exam, find the upper 10% of exam scores.

3) Referring to Final Exam, find a 90% confidence interval for students' exam scores, i. e., find an interval centered at 78 so that 90% of the exam scores fall within the interval.

Please do not just give me an excel spreadsheet with the answers like the last tutor did. I need someone to show me how to find these values, tell me what equations to use, etc.

Reference no: EM131429684

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