Chapter 7: Q.84 (page 434)
Find the probability that the average price for gas stations is less than .
a.
b.
c.
d.
e.
Short Answer
The probability that the average price for 30 gas station is less than is.
Therefore, option 'c' is the correct answer
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Chapter 7: Q.84 (page 434)
Find the probability that the average price for gas stations is less than .
a.
b.
c.
d.
e.
The probability that the average price for 30 gas station is less than is.
Therefore, option 'c' is the correct answer
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The length of songs in a collector’s iTunes album collection is uniformly distributed from two to minutes. Suppose we randomly pick five albums from the collection. There are a total of songs on the five albums.
a. In words,
b.
c. In words,
d.
e. Find the first quartile for the average song length, .
f. The IQR (interquartile range) for the average song length, , is from ___ - ___.
Suppose that the duration of a particular type of criminal trial is known to have a mean of days and a standard deviation of seven days. We randomly sample nine trials.
a. In words,
b.
c. Find the probability that the total length of the nine trials is at least days.
d. Ninety percent of the total of nine of these types of trials will last at least how long?
Suppose that the length of research papers is uniformly distributed from ten to \(25\) pages. We survey a class in which \(55\) research papers were turned in to a professor. The \(55\) research papers are considered a random collection of all papers. We are interested in the average length of the research papers.
a. In words, \(X= \)
b. \(X= ( , )\)
c. \(\mu_{x}= \)
The percent of fat calories that a person in America consumes each day is normally distributed with a mean of about and a standard deviation of about ten. Suppose that individuals are randomly chosen. Let role="math" localid="1648361500255" average percent of fat calories.
a. _____ (______, ______)
b. For the group of , find the probability that the average percent of fat calories consumed is more than five. Graph the situation and shade in the area to be determined.
c. Find the first quartile for the average percent of fat calories.
The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.
Find the IQR for the mean amount of time 64 batteries last.
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