Nationally, 38% of fourth-graders cannot read an age-appropriate book. The following data show the number of children,
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September 6, 2001).
Age Number of Children
6 ............ 37,369
7 ............ 87,436
8 ............160,840
9 ............239,719
10 .............286,719
11 .............306,533
12 .............310,787
13 .............302,604
14 .............289,168
Suppose that we want to select a sample of children identified as learning disabled under special education for a program designed to improve reading ability. Let x be a random variable indicating the age of one randomly selected child.
a. Use the data to develop a probability distribution for x. Specify the values for the random variable and the corresponding values for the probability function f (x).
b. Draw a graph of the probability distribution.
c. Show that the probability distribution satisfies equations (5.1) and (5.2).
Related Book For
Probability & Statistics for Engineers & Scientists
ISBN: 978-0130415295
7th Edition
Authors: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying
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