Problem#2 23. Reading Rates The reading speed of second grade students is approximately normal, with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm. (a) What is the probability a randomly selected student will read more than 95 words per minute? (b) What is the probability that a random sample of 12 sec- ond grade students results in a mean reading rate of more than 95 words per minute? (c) What is the probability that a random sample of 24 sec- ond grade students results in a mean reading rate of more than 95 words per minute? (d) What effect does increasing the sample size have on the probability? Provide an explanation for this result. (e) A teacher instituted a new reading program at school. After 10 weeks in the program, it was found that the mean read- ing speed of a random sample of 20 second grade students was 92.8 wpm. What might you conclude based on this result? Answer (a) 30.85% (b) 4.16% (c) 0.72% (e) 10.52% of samples will be above 92.8

Problem#2 23. Reading Rates The reading speed of second grade students is approximately normal, with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm. (a) What is the probability a randomly selected student will read more than 95 words per minute? (b) What is the probability that a random sample of 12 sec- ond grade students results in a mean reading rate of more than 95 words per minute? (c) What is the probability that a random sample of 24 sec- ond grade students results in a mean reading rate of more than 95 words per minute? (d) What effect does increasing the sample size have on the probability? Provide an explanation for this result. (e) A teacher instituted a new reading program at school. After 10 weeks in the program, it was found that the mean read- ing speed of a random sample of 20 second grade students was 92.8 wpm. What might you conclude based on this result? Answer (a) 30.85% (b) 4.16% (c) 0.72% (e) 10.52% of samples will be above 92.8

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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