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3 years ago

I’ll give brainliist

Mathematics

1 answer:

34kurt3 years ago

3 0

Step-by-step explanation:

The line is

j --------K----------M---------N---------L

6. 4. 4. 4

JN = 14

KM = 4

KM = MN = LN =4

JK = 14 - (KM+MN)

JK = 14 - 8 = 6

JK = 6

MN = 4

LJ = 18

KN = 8

MJ = 10

NL = 4

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Can I get some help on these two

tia_tia [17]

9514 1404 393

Answer:

cone: 138.16 in²

pyramid: 352 m²

Step-by-step explanation:

Use the appropriate formula from your list of area and volume formulas.

Area of a Cone

A = πr(r +h) . . . . . where r is the radius and h is the slant height

The radius is half the diameter, so is 4 inches.

A = π(4 in)(4 in + 7 in) = 44π in² ≈ 138.16 in²

Lateral Area of a Square Pyramid

A = 2sh . . . . . where s is the side length of the base and h is the slant height

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2 years ago

What is the formula for the expected number of successes in a binomial experiment with n trials and probability of success p? C

charle [14.2K]

Answer:

$(D)E[ X ] =np.$

Step-by-step explanation:

Given a binomial experiment with n trials and probability of success p,

$f(x)=\left(\begin{array}{c}n\\k\end{array}\right)p^x(1-p)^{n-x}, 0\leq x\leq n$

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Since each term of the summation is multiplied by x, the value of the term corresponding to x = 0 will be 0. Therefore the expected value becomes:

$E(X)=\sum_{x=1}^{n}x\left(\begin{array}{c}n\\x\end{array}\right)p^x(1-p)^{n-x}$

Now,

$x\left(\begin{array}{c}n\\x\end{array}\right)= \frac{xn!}{x!(n-x)!}=\frac{n!}{(x-)!(n-x)!}=\frac{n(n-1)!}{(x-1)!((n-1)-(x-1))!}=n\left(\begin{array}{c}n-1\\x-1\end{array}\right)$

Substituting,

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Factoring out the n and one p from the above expression:

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Representing k=x-1 in the above gives us:

$E(X)=np\sum_{k=0}^{n}n\left(\begin{array}{c}n-1\\k\end{array}\right)p^{k}(1-p)^{(n-1)-k}$

This can then be written by the Binomial Formula as:

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3 years ago

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Answer:

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