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You keep them if you test 3 and all pass.
There are 18 good ones and 6 bad (making 24)
Chance of first passing is 18/24
If it passes, there are now one less good and one less total.
Chance of second passing is 17/23
If it passes, there are now one less good and one less total.
Chance of second passing is 16/22
Total is (16 x 17 x 18) / (22 x 23 x 24) = about 0.4 (0.403162055 is you really want to know).
So probability all are ok is 0.4
Thus probability you find at least one bad one is 0.6
What else can I help you with?
What are the four Maxwell's equation?
Gauss's law: Electric charges produce an electric field. Gauss's law for magnetism: There are no magnetic monopoles. Faraday's law: Time-varying magnetic fields produce an electric field. Ampère's law: Steady currents and time-varying electric fields produce a magnetic field.
What are the physical significance of Maxwell's equations?
As per my knowledge,Maxwell's equations describes the relations between changing electric and magnetic fields. That means time varying electric field can be produced by time varying magnetic field and time varying magnetic field can be produced by time varying electric field.
What is function of pantograph?
A pantograph is an apparatus mounted on the roof of an electric train to collect power through contact with an overhead catenarywire.
Electric City is having a sale on compact discs The regular price of 14.00 is decreased by 20 percent What is the sale price?
11.20
Algebra 2 answers speeding through the lines?
the first road vehicleto exceed 104 km/hr was an electric car
Three defective electric toothbrushes were accidentally shipped to a drugstore by the manufacturer along with 17 non-defective ones What is the probability that the first two electric toothbrushes so?
(3/20) * (2/19) = 6/380 = 0.01579 [General Rule of Multiplication]. B) What is the probability that the first two electric toothbrushes sold will not be defective? (17/20) * (16/19) = 272/380 = 0.7158 [General Rule of Multiplication].
What corporation in 1959 claimed to be the world's largest maker of electric typewriters?
Royal McBee the maker of Royal electric typewriters claimed to be the world's largest maker of typewriters.
A random sample of 317 new smile bright electric toothbrushes showed 19 were defective how would you estimate the probability that a new toothbrush is defective what is your estimate?
0.06 or 6%
Do typewriters need batteries?
Manual typewriters are entirely mechanical and do not require any electricity. There are some battery-powered portable electric typewriters, but I do not believe that any are still being manufactured.
Can a defective hot water heater double your electric bill?
Yes, a defective hot water heater can cause an increase in your electric bill. If the heater is not functioning properly, it may run continuously or inefficiently, leading to higher energy consumption. It's important to address any issues with your hot water heater to ensure it is operating efficiently.
When was the computer keyboard invented?
existing electric typewriters were adapted for use on several early computers.
Which of the following was not a nineteenth-century innovation?
radio motion pictures telephone electric lights typewriters
Do typewriters take electricity during our work?
A manual typewriter does not take electricity, an electric typewriter does.
How typewriters began to phase out?
Electric typewriters began to become a regular thing in the 1970's, and, believe it or not, some people used them all the way until the 1990s when computers became a regular device (though most offices had computers installed in the 1980s). The final typewriters were much more advanced than you might think-- some electric typewriters from the late 1980s had LCD displays and printers that could be plugged in. It was not the typical, loud, clacky typewriter of the early 20th century.
What has the author Terry Leander Kinsey written?
Terry Leander Kinsey has written: 'Audio-typing and electric typewriters'
Why is there no electric to fuel pump?
Blown fuse, defective fuel pump relay.
How heavy is a typewriter?
Typewriters can vary in weight depending on the make and model. On average, a standard manual typewriter typically weighs around 10-20 pounds, while electric typewriters may be slightly heavier due to the added machinery.
