Chapter 7: Q. 78 (page 433)
a.
b.
c.
d.
Short Answer
. Therefore, option "a" is the correct answer.
Chapter 7: Q. 78 (page 433)
a.
b.
c.
d.
. Therefore, option "a" is the correct answer.
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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?
Find the percentage of sums betweenstandard deviations below the mean of the sums and one standard deviation above the mean of the sums.
Salaries for teachers in a particular elementary school district are normally distributed with a mean ofand a standard deviation of . We randomly survey ten teachers from that district.
a. Find thepercentile for an individual teacher’s salary.
b. Find the percentile for the average teacher’s salary.
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.
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