Q1: Suppose that discrete random variable X~unif [1,2,3]. A random sample of n=36 is selected from this population. Find the probability that the sample mean is greater than 2.1 but less than 2.5, assuming that the sample mean would be measured to the nearest tenth.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 32E
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Q1: Suppose that discrete random variable X~unif [1,2,3]. A random sample of n=36 is selected
from this population.
Find the probability that the sample mean is greater than 2.1 but less than 2.5, assuming that the
sample mean would be measured to the nearest tenth.
Q2: The Bureau of Meteorology of the Australian Government provided the mean annual rainfall in
millimeters
499.2, 555.2, 398.8, 391.9, 453.4, 459.8, 483.7, 417.6, 469.2, 452.4, 499.3, 340.6, 522.8, 469.9,
527.2, 565.5, 584.1, 727.3, 558.6, 338.6
Find the 95% two-sided confidence interval for the mean annual rainfall.
Q3: The brightness of a television picture tube can be evaluated by measuring the amount of current
required to achieve a particular brightness level. A sample of 10 tubes results in a sample mean of
317.2 and sample standard deviation of 15.7 (in microamps).
Find a 99% two-sided confidence interval on mean current required.
Transcribed Image Text:Q1: Suppose that discrete random variable X~unif [1,2,3]. A random sample of n=36 is selected from this population. Find the probability that the sample mean is greater than 2.1 but less than 2.5, assuming that the sample mean would be measured to the nearest tenth. Q2: The Bureau of Meteorology of the Australian Government provided the mean annual rainfall in millimeters 499.2, 555.2, 398.8, 391.9, 453.4, 459.8, 483.7, 417.6, 469.2, 452.4, 499.3, 340.6, 522.8, 469.9, 527.2, 565.5, 584.1, 727.3, 558.6, 338.6 Find the 95% two-sided confidence interval for the mean annual rainfall. Q3: The brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a particular brightness level. A sample of 10 tubes results in a sample mean of 317.2 and sample standard deviation of 15.7 (in microamps). Find a 99% two-sided confidence interval on mean current required.
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