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Chapter 7: Q.27 (page 429)
In order for the sums of distribution to approach a normal distribution, what must be true?
The sample size,gets larger.
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A typical adult has an average IQ score of with a standard deviation of . If randomly selected adults are given an IQ test, what are the probability that the sample mean scores will be between and points?
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 ___ - ___.
What three things must you know about distribution to find the probability of sums?
An unknown distribution has a mean of and a standard deviation of . A sample size of is drawn randomly from the population.
Find the sum that is two standard deviations above the mean of the sums.
Find the percentage of sums between 1.5 standard deviations below the mean and one standard deviation above the mean.
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