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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?
Wiki User
∙ 11y ago
0.06 or 6%
Wiki User
∙ 11y ago
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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 is the percentage of plaque removed by a manual toothbrush compared to an electric toothbrush against electric toothbrushes?
80% verses 50%
Are manual toothbrushes better than electric toothbrushes?
Any toothbrush is only as effective as the person using it. If used properly, most manual toothbrushes can adequately clean your mouth. I typically recommend electric toothbrushes to people who have some kind of physical limitation, such as arthritis.
What is the best electric toothbrush on the market?
I actually discovered that there are lots of brand that manufacture electric toothbrushes. Please checkout www.sonicare.philips.com/ for the best in the market.
Who are the leading producers of electric toothbrushes?
Gillette had 26.5 percent of the electric toothbrush market in 2002, followed by Proctor and Gamble with 18.3 percent and Philips with 15.6 percent.
Are electric toothbrushes really that much better than your standard, hand-held toothbrushes?
absolutely! I own the oral B professional smart series and it cleans like the dentist Electric toothbrushes have integrated technology that cleans teeth extrememly better than the average toothbrush. Electric toothbrushes are AWESOME! they clean teeth way better and in less time. Sonic care toothbrushes in combination with colgate total toothpaste are by far the best way to clean your teeth outside of a dentists office.
Are electric toothbrushes really better than regular ones?
Indeed electric toothbrushes are better than regular ones. The pasonic toothbrush i would recomend. It brushes 100 times per minute. So overall i would say Eletric tootbrushes are better than the regular ones.
When were the Oral B Elecctronic Toothbrushes made?
The first Oral B toothbrush was designed in 1950. In 1978 the first electric Oral B toothbrush was produced. They called this first type D1 and it was simulating the movements of a manual brush.
Can an electric toothbrush be repaired?
New parts for electric toothbrushes - including new brush heads - are accessible from the maker and post-retail suppliers and are ordinarily sold through medication and markdown stores. On the off chance that you do need to chip away at an electric toothbrush, about the main instruments you'll need are a screwdriver and possibly a multime.
What are the benefits of owning an electric tooth brush?
oral b vitality i love it There's not much evidence that electric toothbrushes are better than manual toothbrushes. But it's very clear that they're not worse. In the case of the ones with timers, their biggest benefit is probably just getting you to brush as long as you should (two or three minutes). There is some evidence that electric toothbrushes that spin in both directions, like some made by Oral-B, are better than manual brushes. My dentist recommended a two-speed electric toothbrush. The faster speed is for your teeth, the slower speed is for your gums. You need to be gentle with your gums.
Does it tickle if you use an electric toothbrush?
depends where your using the electric toothbrush! ! :)
Where can I find a cheap electric toothbrush?
Electric toothbrushes can be found in any drugstore though you may not get the lowest price without waiting for a sale. To find one at a cheaper cost, visit www.amazon.com as they carry numerous brands at varying costs.
