Question
In: Math
Three students answer a true-false question on a test randomly. A random variable x represents the...
Three students answer a true-false question on a test randomly. A random variable x represents the number of answers of true among the three students, taking on the value 0, 1, 2, or 3.
(a) Find the frequency distribution for x.
(b) Find the probability distribution for x.
For the same random variable x as the previous problem, find the following:
(a) The expected value (b) The variance (c) The standard deviation
Solutions
milcah answered 2 years agoRelated Solutions
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Let x be a random variable that represents the level of glucose in the blood (milligrams...
Let x be a random variable that represents the level of glucose
in the blood (milligrams per deciliter of blood) after a 12-hour
fast. Assume that for people under 50 years old, x has a
distribution that is approximately normal, with mean μ = 88 and
estimated standard deviation σ = 28. A test result x < 40 is an
indication of severe excess insulin, and medication is usually
prescribed.
(a) What is the probability that, on a single test,...
Let x be a random variable that represents the level of glucose in the blood (milligrams...
Let x be a random variable that represents the level of
glucose in the blood (milligrams per deciliter of blood) after a 12
hour fast. Assume that for people under 50 years old, x
has a distribution that is approximately normal, with mean
μ = 96 and estimated standard deviation σ = 47. A
test result x < 40 is an indication of severe excess
insulin, and medication is usually prescribed.
(a) What is the probability that, on a single...
Let x be a random variable that represents the level of glucose in the blood (milligrams...
Let x be a random variable that represents the level of
glucose in the blood (milligrams per deciliter of blood) after a 12
hour fast. Assume that for people under 50 years old, x
has a distribution that is approximately normal, with mean
μ = 84 and estimated standard deviation σ = 29. A
test result x < 40 is an indication of severe excess
insulin, and medication is usually prescribed.
(a) What is the probability that, on a single...
Let x be a random variable that represents the level of glucose in the blood (milligrams...
Let x be a random variable that represents the level of
glucose in the blood (milligrams per deciliter of blood) after a 12
hour fast. Assume that for people under 50 years old, x
has a distribution that is approximately normal, with mean
μ = 60and estimated standard deviation σ = 32. A
test result x < 40 is an indication of severe excess
insulin, and medication is usually prescribed.
(a) What is the probability that, on a single test,...
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