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iren [92.7K]
2 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]2 years ago
3 0
4/5 recommend, so about 4/5(120) = 96 doctors recommend the brand.
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Answer:

10 units.

2√7 units.

- (or 5.29 units to the nearest hundredth)

Step-by-step explanation:

If the 2 sides are legs of the triangle ( that is they are at 90 degrees to each other) the third side, by Pythagoras  theorem:

=  √(6^2 + 8^2)

=  √100

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The other possibility is that 8 is the length of the hypotenuse, in which case

The third side

=  √(8^2 - 6^2)

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devlian [24]

The value of c for which the considered trinomial becomes perfect square trinomial is: 20 or -20

<h3>What are perfect squares trinomials?</h3>

They are those expressions which are found by squaring binomial expressions.

Since the given trinomials are with degree 2, thus, if they are perfect square, the binomial which was used to make them must be linear.

Let the binomial term was ax + b(a linear expression is always writable in this form where a and b are constants and m is a variable), then we will obtain:

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Comparing this expression with the expression we're provided with:

x^2 + 10x + c

we see that:

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Learn more about perfect square trinomials here:

brainly.com/question/88561

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