Plz halp. For a quick reference of the equations, the book is \"Applied Statisti

Question

Plz halp. For a quick reference of the equations, the book is "Applied Statistics and Probabilities for Engineers 6th edition." (Chegg or google will yield this book's pdf).

3. The distribution of final exam scores (out of 100 points total) in a large Probability and Statistics course followed (very closely a Normal distribution with mean Au 79 and variance 36 (hence o 6). The professor decides that only the top 10% of the class scores will be an "A type" grade (e.g., from "A up to "A What score value r must a student get at least (2) in order to get an A type grade?

Explanation / Answer

Mean is 79 and SD is 6

Since we need to find the bottom most value at top 10%. We need to find the topmost value at the 90%. So from the normal distribution table, we get the z value from it for area of 0.9 under the curve as 1.28 thus x= 1.28*6+79= 85.68

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