Question : Find the value of k that makes f(x) = kx^2 a probability density function on the interval : 2163577
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
35) Find the value of k that makes f(x) = kx2 a probability density function on the interval 0 ≤ x ≤ 1.
Enter just an integer.
36) Find the value of k that makes f(x) = 3e-kx a probability density function on the interval x ≥ 0.
Enter just an integer.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
37) A random variable X has a cumulative distribution function F(x) = 1 - (1/x2) (x ≥ 1). Find Pr(a ≤ X ≤ 5).
A) 1 - (1/a2)
B) (1/a2)
C) (1/a2) - (1/25)
D) (24/25) - (1/a2)
E) none of these
38) Let X be a continuous random variable with a cumulative distribution function F(x) = 1 - e-x^2 (x ≥ 0). Find Pr(1 ≤ X ≤ 2).
A) e-1 - e-2
B) e-1 - e-4
C) e-1 - e-2 - 2
D) 1 - e-1 - e-2
E) none of these
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
39) The probability density function for a random variable X is f(x) = 3x-4, x ≥ 1. Find Pr(2 ≤ X).
Enter just a reduced fraction.
40) The probability density function for a random variable X is f(x) = (3/4)(2x - x2), 0 ≤ x ≤ 2 . Find Pr(0 ≤ X ≤ 1).
Enter just a reduced fraction.
41) The probability density function for a random variable X is f(x) = (2lnx/(ln4)2 x) , 1 ≤ x ≤ 4. Find Pr(1 ≤ X ≤ 2).
Enter just a reduced fraction.
42) The probability density function of a continuous random variable X is f(x) = (3/2)x - (3/4)x2 , 0 ≤ x ≤ 2. Is this the graph of f(x) with the shaded area corresponding to Pr((1/2) ≤ x ≤ (3/2))?
Enter "yes" or "no".
43) If f(x) = (1/8)x is a probability density function for 0 ≤ x ≤ 4, find F(x), the corresponding cumulative distribution function and use it to find Pr(1 ≤ X ≤ 3).
Enter just a reduced fraction representing Pr(1 ≤ X ≤ 3). Do not label.
44) If f(x) = 6x(1 - x) is a probability density function for 0 ≤ x ≤ 1, find F(x), the corresponding cumulative distribution function and use it to find Pr((1/2) ≤ X ≤ 1).
Enter just a reduced fraction representing Pr((1/2) ≤ X ≤ 1). Do not label.
45) A random variable X has a cumulative distribution function F(x) = 1 - (1/(x + 1)2) for x ≥ 0. Find Pr(1 ≤ X ≤ 4).
Enter just a reduced fraction.
46) Suppose f(x) = (1/x2) is a probability density function for x ≥ 1. Find Pr(2 ≤ X ≤ 10).
Enter just a reduced fraction.
47) Determine the probability of an outcome of the probability density function f(x) = 4x3 being between (1/4) and (1/2) where 0 ≤ x ≤ 1.
Enter just a reduced fraction.
48) Determine the probability of an outcome of the probability density function f(x) =12x2 - 12x3 being between (1/2) and 1 where 0 ≤ x ≤ 1.
Enter just a reduced fraction.
49) A random variable X has a density function f(x) = (1/ln16)⋅(1/x) , 1 ≤ x ≤ 16. Find a such that Pr(1 ≤ X ≤ a) = (3/4).
Enter just an integer, no labels.
50) A random variable X has a density function f(x) = (24/x3), 3 ≤ x ≤ 6. Find b such that Pr(X ≤ b) = 0.4.
Enter your answer exactly in the reduced form a√((b/c)), unlabeled.
51) A random variable X has a cumulative distribution function F(x) = (x/5) - 2, 10 ≤ x ≤ 15. Find a such that Pr(a ≤ X ≤ 15) = (2/3).
Enter just a reduced fraction of form (a/b).
