Why is using the proper joining technique important? What could go wrong if the wrong joining technique is used?
1 answer:
You might be interested in
Answer:
a. The expected number of failures due to a problem with inside wiring is 8 failures
b. The probability that at least 10 failures are due to inside wiring is approximately 0.176
c. It will be not unusual
Explanation:
The probability that the problem of an out of order is the inside wiring, P(x) = 8%
The number of complaints in a month period, x = 100
a. The expected number of failures due to a problem with inside wiring, E(x) = x·P(x)
∴ E(x) = 100 × 8% = 8
The expected number of failures due to a problem with inside wiring, E(x) = 8 failures
b. The probability that at least 10, P₁₀, failures are due to inside wiring is given as follows;
The probability of success, P = 0.08, therefore, the probability of failure, q = 1 - 0.08 = 0.92
P = ·
·
P₀ = ₁₀₀C₀·(0.08)⁰·(0.92)¹⁰⁰ = 0.000239211874657
P₁ = ₁₀₀C₁·(0.08)¹·(0.92)⁹⁹ = 0.00208010325
P₂ = ₁₀₀C₂·(0.08)²·(0.92)⁹⁸ = 0.00895348793
P₃ = ₁₀₀C₃·(0.08)³·(0.92)⁹⁷ = 0.02543309616
P₄ = ₁₀₀C₄·(0.08)⁴·(0.92)⁹⁶ = 0.0536306593
P₅ = ₁₀₀C₅·(0.08)⁵·(0.92)⁹⁵ = 0.0895398833653
P₆ = ₁₀₀C₆·(0.08)⁶·(0.92)⁹⁴ = 0.123279549561
P₇ = ₁₀₀C₃·(0.08)⁷·(0.92)⁹³ = 0.143953759735
P₈ = ₁₀₀C₈·(0.08)⁸·(0.92)⁹² = 0.145518474516
P₉ = ₁₀₀C₉·(0.08)⁹·(0.92)⁹¹ = 0.129349755125
P₁₀ = ₁₀₀C₁₀·(0.08)¹⁰·(0.92)⁹⁰ = 0.10235502362
∴ P₀ + P₁ + P₂ + P₃ + P₄ + P₅ + P₆ + P₇ + P₈ + P₉ + P₁₀ = 0.82433004464
The probability of at least 10 failures are due problem with the inside wiring = 1 - (P₀ + P₁ + P₂ + P₃ + P₄ + P₅ + P₆ + P₇ + P₈ + P₉ + P₁₀) = 1 - 0.82433004464 = 0.175666995536
The probability of at least 10 failures are due problem with the inside wiring = 0.175666995536 ≈ 0.176
c. The probability of at most 5 failures are due problem with the inside wiring = P₀ + P₁ + P₂ + P₃ + P₄ + P₅ = 0.179876441908
Therefore, given that probability of at most 5 failures > The probability of 8 failures it will be not unusual since the cause of failure is more (92%) due to other causes which are more likely and therefore increase in the probability that there are fewer failures due inside wiring
Answer:
Explanation:
For we to calculate the shear stress on the upper plate and give its direction. Sketch the variation of shear stress across the channel, I used hand in solving it, check attached file below
