I. A teacher informs his computational physics class (of 500+ students) that a test was very difficult, but the grades would be curved. Scores on the test were normally distributed with a mean of 25.3 and a standard deviation of 9.Round your answers to at least one decimal place. (a) If the top 13% will receive an A, what is the minimum score to get an A? (b) If the bottom 34% will receive an F, what is the minimum score to pass the class?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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I. A teacher informs his computational physics class (of 500+ students) that a test was very difficult, but the grades would be curved. Scores on the test were normally distributed with a mean of 25.3 and a standard deviation of 9.Round your answers to at least one decimal place.

(a) If the top 13% will receive an A, what is the minimum score to get an A?

(b) If the bottom 34% will receive an F, what is the minimum score to pass the class? 

II. A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 134.5-cm and a standard deviation of 0.8-cm. Answer the following to the nearest tenth of a cm. Find P21, which is the length separating the shortest 21% rods from the longest 79%. P21. 

III. A particular fruit's weights are normally distributed, with a mean of 205 grams and a standard deviation of 26 grams. The heaviest 16% of fruits weigh more than how many grams?

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