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2 years ago

PLSSS I NEED HELP I’LL MARK BRAINLYESS OR WTV IS CALLED

Mathematics

1 answer:

pickupchik [31]2 years ago

5 0

Answer: y= -7 y= -5 y= -3 y= -1

Step-by-step explanation:

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Let x ∼ bin(9, 0.4). find

Kobotan [32]

A.
$\mathbb P(X>6)=\mathbb P(X=7)+\mathbb P(X=8)+\mathbb P(X=9)$
$=\dbinom97(0.4)^7(1-0.4)^{9-7}+\dbinom98(0.4)^8(1-0.4)^{9-8}+\dbinom99(0.4)^9(1-0.4)^{9-9}$
$\approx0.025$

b.
$\mathbb P(X\ge2)=1-\mathbb P(X$
$=1-\dbinom90(0.4)^0(1-0.4)^{9-0}-\dbinom91(0.4)^1(1-0.4)^{9-1}$
$\approx0.929$

c.
$\mathbb P(2\le X$
$=\dbinom92(0.4)^2(1-0.4)^{9-2}+\dbinom93(0.4)^3(1-0.4)^{9-3}+\dbinom94(0.4)^4(1-0.4)^{9-4}$
$\approx0.663$

d.
$\mathbb P(2$
$=\dbinom93(0.4)^3(1-0.4)^{9-3}+\dbinom94(0.4)^4(1-0.4)^{9-4}+\dbinom95(0.4)^5(1-0.4)^{9-5}$
$\approx0.669$

e.
$\mathbb P(X=0)=\dbinom90(0.4)^0(1-0.4)^{9-0}\approx0.01$

f.
$\mathbb P(X=7)=\dbinom97(0.4)^7(1-0.4)^{9-7}\approx0.021$

g, h.
For $X\sim\mathcal B(n,p)$ , recall that $\mathbb 
E[X]=\mu_X=np$ and $\mathbb V[X]={\sigma_X}^2=np(1-p)$ . So

$\mu_X=9(0.4)=3.6$
${\sigma_X}^2=9(0.4)(0.6)=2.16$

6 0

3 years ago

Math. answer plz ty❤️.

maxonik [38]

Answer:

Robert is 10 and his dad is 40 years old

Step-by-step explanation:

We have (4x+5)=3(x+5)

4x+5=3x+15

x=10.

Roberts is 10 years old and his father is 40 years old.

3 0

3 years ago

Read 2 more answers

In AWXY, X = 1.5 inches, w = 2.1 inches and Angle W=55º. Find all possible values of Angle X, to the nearest 10th of a degree.

yanalaym [24]

Answer:

35.8

Step-by-step explanation:

8 0

3 years ago

please help me i will mark brainliest pls i have been doing thhis for hours and i neede to pass the 7th grade

BlackZzzverrR [31]

Answer:

521, 400

Step-by-step explanation:

with the 1cm= 100m scale

6.6cm= 660m

7.9cm=790m

so the area would be 660×790

which is 521,400 meters squared

3 0

2 years ago

A bag contains 72 toffees. How many toffees can be stored in 122 such bags? Estimate the number of toffees to nearest tens.

d1i1m1o1n [39]

The exact number is 8,784 toffees but if you want me to estimate to the nearest tens then it would be 8,780

5 0

3 years ago