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Chapter 7: Q. 58 (page 430)
A uniform distribution has a minimum of six and a maximum of ten. A sample of is taken.
Find the first quartile for the sums.
The first quartile for the sums is .
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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.
What is the distribution for the total length of time 64 batteries last?
What is ?
Suppose that it is past noon on a delivery day, The probability that a person must wait at least one and half more hours is;
a.
b.
c.
d.
7.7 The mean number of minutes for app engagement by a table use is minutes. Suppose the standard deviation is one minute. Take a sample size of .
a. What is the probability that the sum of the sample is between seven hours and ten hours? What does this mean in context of the problem?
b. Find the and percentiles for the sum of the sample. Interpret these values in context.
An unknown distribution has a mean of 19 and a standard deviation of 20. Let X = the object of interest. What is the sample size if the mean of ΣX is 15,200?
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