If two loads are applied to a cantilever beam as shown in the figure below, the bending moment at 0 due to the loads is a₁X₁ + a₂X₂. X1 21 en Suppose that X₁ and X₂ are independent random variables with means 3 and 5 kips, respectively, and standard deviations 0.4 and 1.1 kips, respectively. Suppose that a₁ = 6 ft and a2 = 12 ft. (a) Find the expected value of the bending moment. (b) Find the standard deviation of the bending moment. (c) If X₁ and X₂ are normally distributed, what is the probability that the bending moment will exceed 92 kip-ft?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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If two loads are applied to a cantilever beam as shown in the figure below, the bending moment at 0 due to the
loads is a₁X₁ + a2X₂.
X1
21
Suppose that X₁ and X₂ are independent random variables with means 3 and 5 kips, respectively, and standard
deviations 0.4 and 1.1 kips, respectively. Suppose that a₁ = 6 ft and a2
= 12 ft.
(a) Find the expected value of the bending moment.
(b) Find the standard deviation of the bending moment.
(c) If X₁ and X₂ are normally distributed, what is the probability that the bending moment will exceed 92 kip-ft?
Transcribed Image Text:If two loads are applied to a cantilever beam as shown in the figure below, the bending moment at 0 due to the loads is a₁X₁ + a2X₂. X1 21 Suppose that X₁ and X₂ are independent random variables with means 3 and 5 kips, respectively, and standard deviations 0.4 and 1.1 kips, respectively. Suppose that a₁ = 6 ft and a2 = 12 ft. (a) Find the expected value of the bending moment. (b) Find the standard deviation of the bending moment. (c) If X₁ and X₂ are normally distributed, what is the probability that the bending moment will exceed 92 kip-ft?
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