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iren [92.7K]
3 years ago
8

According to a commercial, 4 out of 5 dentist recommend a certain brand of toothpaste. Suppose There are 120 dentist in your are

a. What is the expected number of dentist who recommend the brand? What is the standard deviation? Needing assistance with calculating the standard deviation please.
Mathematics
1 answer:
Genrish500 [490]3 years ago
3 0
4/5 recommend, so about 4/5(120) = 96 doctors recommend the brand.
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A + B
Klio2033 [76]

Answer:

A= 0.5 and B= 4040

Step-by-step explanation:

If you write out the equation and rearrange a little it gets easier to understand.

( a + b) + (a*b) + (a - b)  you can rewrite this as

a + b + a - b + (a*b)  this is the same as 2a + ab = 2021

The way I looked at it is to figure out how to get that number 1 at the end.

The number 2020 is easy to get to.  How can you get the number 1 using either 2a or ab.

I looked at a = 0.5.   2 times 0.5 would be 1.

So now what would b have to be?  We can get the 1 at the end with the 2a part of the equation so now we have to get ab = 2020.

b = 2020/a  which using our a = 0.5, you can see that b would have to equal 4040.  Test it all out in your equation.

0.5 + 4040 + (0.5 * 4040) + 0.5 - 4040

4040.5 + (2020) - 4039.5 = 2021

So A = 0.5  and B = 4040

4 0
3 years ago
(APEX) Factor a number, variable, or expression out of the trinomial shown below:
Ivan
Funny... I'm doing a lesson on factoring right now :) 

The Greatest Common Factor would be 4, the biggest number that divides into all of them evenly. You would factor out the 4.

4(x² - 4x + 2)
Hope this helps!!!
4 0
4 years ago
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The airline that Vince is using has a
emmainna [20.7K]

Answer:

Each bag must NOT exceed 62 inches (157.48 centimeters) in overall dimensions (length + width + height) and CANNOT exceed 70 pounds (31.75 kg). Overweight bag fees will apply to bags weighing over 50 pounds (22.73 kg).

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Colombia: 16% of baggage fee

Saint Lucia: 7.5% of baggage fee

Barbados: 17.5% of baggage fee

Step-by-step explanation:

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Snacks For Less sells one pound of peanuts for $3.57. Economy Nuts sells one pound for $3.52. At which store do peanuts cost les
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Economy nuts has the lowest price
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Hey guys ( or gals ) I have no idea what to do please help me.
shepuryov [24]

Answer:

Irrational numbers cannot be written as a fraction, or the ratio of two whole numbers.

You would have to find a GCF (greatest common factor) and multiply it out of the radical.

ex.

\sqrt{6} = 2 x 2 x 2

when you have to multiplier numbers then you can combine two of them to take outside the radical, meaning 2x2x2

2\sqrt{2\\}

so \sqrt{6} would be closest to the positive 2 on the number line and 2 notches.

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is an irrational number, so it might fall into 3.3 if turned into a decimal.

Step-by-step explanation:

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