# Research & Evaluation I

posted by .

I have an airplane that has an ignition system that works like this. There are 2 energy producing devices, called magnetos
that "fire" the spark plugs, 2 per cylinder. There is a 1 in a 1000 chance that one will fail.
What is the chance that one or the other will fail?
What is the chance that both will fail?
What is the chance that neither will fail?

• Research & Evaluation I -

probability one will fail : 1/1000 * 999/1000 * 2

prob both will fail: 1/1000 ^2

Prob neither: (999/1000)^2

check: all three of these should add to 1.

999*2/1E6+ 1/1E6 + 999^2/1E6

999(2+999) + 1 / 1E6=

(1000-1)(1000+1)+ 1 /1E6
1E6-1+1 /1E6 = 1 checks.

## Similar Questions

1. ### chem

Can someone check this for me? Predict which reactions are spontaneous: a) Zn(s) + 2H+(aq) --> Zn+2(aq) + H2(g) b) CaCO3(s) + 2H2O(l) --> Ca(OH)2(s) + H2CO3(aq) c) CH4(g) + O2(g) --> CO2(g) + 2H2O(g) d) Ag+(aq) + Cl-(aq) -->
2. ### science

why do power plugs have 3 sockets even though many appliances have plugs with only 2 pins
3. ### physics

Compressing gases requires work and the resulting energy is usually converted to heat; if this heat does not escape, the gas's temperature will rise. This effect is used in diesel engines: The compressed air gets so hot that when the …
4. ### Physics

Inside the cylinders of a diesel engine, the mixture of fuel and air is compressed to about 1/20 of its original volume. Although diesel engines have no spark plugs to ignite this mixture, it ignites anyway because of what?
5. ### statistics

I have an airplane that has an ignition system that works like this. There are 2 energy producing devices, called magnetos that "fire" the spark plugs, 2 per cylinder. There is a 1 in a 1000 chance that one will fail. What is the chance …
6. ### research & Evaluation

I have an airplane that has an ignition system that works like this. There are 2 energy producing devices, called magnetos that "fire" the spark plugs, 2 per cylinder. There is a 1 in a 1000 chance that one will fail. What is the chance …
7. ### physics

A rocket has a per-ignition mass of 1100kgs-1 producing a thrust of 10000N. How long after ignition of the fuel will the rocket lift off?
8. ### physics

(ignore the other question i posted this is the right one) A rocket has a pre-ignition mass of 1100kg. On ignition it burns fuel at rate of 20kg s-1 producing a thrust of 10000N. How long after ignition of the fuel, will the rocket …
9. ### Research Methodology and Program Evaluation

Good morning, I wanted to see if someone could help me with the following questions because I am not too sure. Examining groups of people is considered an option in program evaluation. True False I selected false because there are …
10. ### Research Methodology and Program Evaluation

Good morning, I wanted to see if someone could help me with the following questions because I am not too sure. Examining groups of people is considered an option in program evaluation. True False I selected false because there are …

More Similar Questions