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3 years ago

Somebody gimmme the answer to my most recent question on my profile pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Mathematics

1 answer:

GuDViN [60]3 years ago

5 0

Lol i dont think i can look at your profile and see the question

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Evaluate C_n.xP^xQn-x For the given n=7, x=2, p=1/2

r-ruslan [8.4K]

Answer:

The value of given expression is $\frac{21}{128}$ .

Step-by-step explanation:

Given information: n=7, x=2, p=1/2

$q=1-p=1-\frac{1}{2}=\frac{1}{2}$

The given expression is

$C(n,x)p^xq^{n-x}$

It can be written as

$^nC_xp^xq^{n-x}$

Substitute n=7, x=2, p=1/2 and q=1/2 in the above formula.

$^7C_2(\frac{1}{2})^2(\frac{1}{2})^{7-2}$

$\frac{7!}{2!(7-2)!}(\frac{1}{2})^2(\frac{1}{2})^{5}$

$\frac{7!}{2!5!}(\frac{1}{2})^{2+5}$

$\frac{7\times 6\times 5!}{2\times 5!}(\frac{1}{2})^{2+5}$

$21(\frac{1}{2})^{7}$

$\frac{21}{128}$

Therefore the value of given expression is $\frac{21}{128}$ .

7 0

3 years ago

X + (2x + 5) = 3(x – 4)+7

eduard

Answer:

Not true

Step-by-step explanation:

x + (2x + 5) = 3(x – 4)+7

Opening bracket on left and side and distributing 3 over (x-4) on right hand side

x+2x+5=3x-3 x 4 + 7

adding like terms

3x+5=3x-12+7

3x+5=3x-5

Hence

5 = -5

Which is not possible , Hence the equation given to us is false.

5 0

3 years ago

A book can be classified as either non dash fiction or fiction. Suppose that 87% of books are classified as fiction. (a) Two b

Mnenie [13.5K]

Answer:

0.7569, 0.5729,0.4371

Step-by-step explanation:

Given that the books are of only two types either non dash fiction or fiction.

Also probability of selecting a fiction = 0.87 = p

X - no of books fiction selected is binomial with p = 0.87 and n =2

(since each trial is independent of the other and there are only two trials)

a) the probability that both books are fiction=

$P(X=2) = 0.87^2 = \\0.7569$

b) Here n =4 with same p.

$P(X=4) =0.87^4 \\= 0.5729$

c) Prob atleast one is non dash fiction = $P(X< 4)\\= 1-P(X=4)\\=1-0.87^4\\=0.4371$

This is not unusual since 0.4371 probability is not nearer to 0 it is almost half.

3 0

4 years ago

A miner has 8 diamonds. He has 48 workers. Explain how each worker can get a piece of the diamonds.

Dmitrij [34]

Answer:

The worker can get a piece of the diamonds using 48÷8 which it is 6.

Step-by-step explanation:

I hope that it is what you're looking for. I hope this helps

6 0

3 years ago

Can someone help me find the area of this

Doss [256]

Calculate area of right triangle 3×4

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2 years ago

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