c. What is the distribution of > x? > d. If one randomly selected student is timed, find the probability that this student's time will be x - N( 1960 147 between 35 and 38 minutes. e. For the 49 students, find the probability that their average time studying is between 35 and 38 minutes. f. Find the probability that the randomly selected 49 students will have a total study time less than

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Question
Suppose that the amount of time that students spend studying in the library in one sitting is normally
distributed with mean 40 minutes and standard deviation 21 minutes. A researcher observed 49 students
who entered the library to study. Round all answers to 4 decimal places where possible.
a. What is the distribution of X? X - N( 40
21
b. What is the distribution of ? ¤ - N( 40
V, 3
c. What is the distribution of > x? > x - N( 1960
147
d. If one randomly selected student is timed, find the probability that this student's time will be
between 35 and 38 minutes.
e. For the 49 students, find the probability that their average time studying is between 35 and 38
minutes.
f. Find the probability that the randomly selected 49 students will have a total study time less than
1911 minutes.
g. For part e) and f), is the assumption of normal necessary? O YesO No
h. The top 10% of the total study time for groups of 49 students will be given a sticker that says "Great
dedication". What is the least total time that a group can study and still receive a sticker?
minutes
Transcribed Image Text:Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 40 minutes and standard deviation 21 minutes. A researcher observed 49 students who entered the library to study. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( 40 21 b. What is the distribution of ? ¤ - N( 40 V, 3 c. What is the distribution of > x? > x - N( 1960 147 d. If one randomly selected student is timed, find the probability that this student's time will be between 35 and 38 minutes. e. For the 49 students, find the probability that their average time studying is between 35 and 38 minutes. f. Find the probability that the randomly selected 49 students will have a total study time less than 1911 minutes. g. For part e) and f), is the assumption of normal necessary? O YesO No h. The top 10% of the total study time for groups of 49 students will be given a sticker that says "Great dedication". What is the least total time that a group can study and still receive a sticker? minutes
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