Explanation It is given that X follows a normal distribution with mean 500 and standard deviation 60. Reason for correct answer: The EXCEL formula to calculate normal cumulative probability corresponding to a given value for a particular mean and standard deviation is of the form: =NORM.DIST(x, mean, standard_dev, cumulative). In place of “x”, enter the variable value of interest, for “mean”, enter the mean of the distribution, for “standard_dev”, enter the value of the standard deviation of the distribution. If cumulative probability must be found corresponding to value x , the value “1” is to be entered. Otherwise, the value “0” must be entered. Thus, the correct formula to calculate P ( X < 450 ) is: (a) “=NORM.DIST(450,500,60,1)”

6th Edition

ISBN: 9781259957598

Author: DOANE

Publisher: RENT MCG

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Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 7, Problem 16ERQ

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Identify the correct formula to calculate P(X<450).

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Chapter 7, Problem 15ERQ

Chapter 7, Problem 17ERQ

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APPLIED STAT.IN BUS.+ECONOMICS

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