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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 23PFA

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Question

Use the following information to answer A-D. A quiz consists of 10 multiple-choice questions, each having 4 possible answers (a,b,c,d), one of which is correct. [Hint: think binomial, a question is either correct or incorrect]

a) What is the mean (to the nearest 0.1) number of questions that are correct assuming you guessed on all 10 questions?

b) What is the standard deviation (to the nearest 0.1) of the number of questions that are correct assuming you guessed on all 10 questions?

c) What is the probability (to the nearest 0.0001) that exactly 4 of the questions are correct assuming you guessed on all 10 questions? [Show all work]

d) For any standard normal distribution, find the area to the right of Z= -0.28.

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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