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3 years ago

Please help me with this math problem (having trouble)

Mathematics

2 answers:

babymother [125]3 years ago

5 0

Answer:

A≈2026.8

Explanation:

By using the formula,

A=2πd/ 2h+2π(d /2)^2

we can find the surface area of the cylinder.

(PS. dont mess up your order of operations!)

Hope it helps!

dezoksy [38]3 years ago

4 0

Answer: $2025.80ft^2$

Step-by-step explanation:

$Formula: A=2\pi rh+2\pi r^2$

Diameter: 25.4ft

Height: 12.7ft

Radius: $\frac{d}{2}=\frac{25.4ft}{2}=12.7ft$

$A=2(3.14)(12.7ft)(12.7ft)+2(3.14)(12.7ft)^2\\A=1012.90ft^2+1012.90ft^2\\A=2025.80ft^2$

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And replacing we got:

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We have the following distribution

x 0 1 2 3 4

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For this case:

$P(X=3) = 0.1$

Part b

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$P(X\geq 3) =1-P(X$

And replacing we got:

$P(X \geq 3) = 1- [0.2+0.3+0.1]= 0.4$

Part c

For this case we want this probability:

$P(X=4) = 0.3$

Part d

$P(X=0) = 0.2$

Part e

We can find the mean with this formula:

$E(X)= \sum_{i=1}^n X_i P(X_i)$

And replacing we got:

$E(X) =0*0.2 +1*0.3+2*0.1 +3*0.1 +4*0.3= 2$

Part f

We can find the second moment with this formula

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And replacing we got:

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$Var(X0 =E(X^2)- [E(X)]^2 = 6.4 -(2^2)= 2.4$

And the deviation:

$\sigma =\sqrt{2.4} = 1.549$

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