# 2100 many middle schools have initiated a program

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(2.100) Many middle schools have initiated a program that provides every stu-dent with a free laptop computer. Student usage of laptops at a middleschool that participates in the initiative was investigated inAmericanSecondary Education(Fall 2009). In a sample of 106 students, the re-searchers reported the following statistics on how many minutes perday each student used his or her laptop for taking notes:¯x= 13.2,s= 19.5.(a) Compute the interval, ¯x±2s.(b) Explain why the distribution of laptop usage for taking notes forthese 106 students cannot be symmetric.(c) Given your answer to part (b), what percentage of the 106 studentshave laptop usages that fall within the ¯x±2sinterval?(2.118) University of Hawaii language professors C. Hitosugi and R. Day incor-porated a 10-week extensive reading program into a second-semesterJapanese language course in an effort to improve students’ Japanesereading comprehension (Reading in a Foreign Language, April, 2004).The professors collected 266 books originally written for Japanese chil-dren and required their students to read at least 40 of them as part of2

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