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Alinara [238K]
3 years ago
14

What’s the mean, variance and standard deviation

Mathematics
1 answer:
Tom [10]3 years ago
3 0

Answer:

Step-by-step explanation:

binomial distritubtion

mean= n*p

.23*300= 69

variance= n*p*(1-p)

.23*300*(1-.23)=53.1

standard deviation= sqrt(variance)

sqrt(53.13)= 7.3

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Debra bought 7 boxes of chocolates. Each box cost $9.55. How much did she spend?
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Answer:

$66.85

Step-by-step explanation:

One box equals $9.55.

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7 × 9.55 = 66.85.

Debra spent $66.85 for all seven boxes of chocolates.

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3 years ago
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Answer:

<h2><em>V(x) =</em> <em>4x³ - 72x² + 308x</em></h2>

Step-by-step explanation:

<em>Look at the picture</em>.

The formula of a volume of a rectangular prism is:

<em>V = lwh</em>

<em>l</em> - length

<em>w</em><em> - width</em>

<em>h</em><em> - height</em>

We have

<em>l = 22 - 2x, w = 14 - 2x, h = x</em>

Substitute:

<em>V = (22 - 2x)(14 - 2x)(x)</em><em>    use FOIL: (a + b)(c + d) = ac + d + bc + bd</em>

<em>V = [(22)(14) + (22)(-2x) + (-2x)(14) + (-2x)(-2x)](x)</em>

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<em>V = (4x² - 72x + 308)(x)      </em><em>use the distributive property a(b + c) = ab + ac</em>

<em>V = (4x²)(x) + (-72x)(x) + (308)(x)</em>

<em>V = 4x³ - 72x² + 308x</em>

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