Scores on a standardized exam for 2nd graders are approximately normally distributed with a mean of 72 and a standard deviation of 6.a)b)c) **Scores on a standardized exam for 2nd graders are approximately normally distributed with a mean of 72 and a standard deviation of 6.****a. What is the probability that a 2nd grader will score above 72 on the exam?****b. What is the exam score at the 25th percentile of the distribution?****c. What is the exam score at the 95th percentile (such that only 5% of all 2nd graders score above it)?**

Answered: Scores on a standardized exam for 2nd…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Scores on a standardized exam for 2nd graders are approximately normally distributed with a mean of 72 and a standard deviation of 6. a) b) c)

**Scores on a standardized exam for 2nd graders are approximately normally distributed with a mean of 72 and a standard deviation of 6.**

**a. What is the probability that a 2nd grader will score above 72 on the exam?**

**b. What is the exam score at the 25th percentile of the distribution?**

**c. What is the exam score at the 95th percentile (such that only 5% of all 2nd graders score above it)?**

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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