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STALIN [3.7K]
3 years ago
14

THE WEEK IS HERE!!!!! ITS THE WEEK!!!!!!!!!!! OMGGG I GOT MY EXAMS THIS WEEK AND I FOUND OUT THEY LIKE 50 QUESTIONSSS AND OTHER

ONE 45 QUESTIONS AND THEN OTHER 30!!!! ITS ONLY 3 OF THEM(MATH, BIOLOGY, ELA) BUT I NEED HELPPP IIKE IM FREAKIN OUT CAUSE I FAILIN AND I NEED TO PASS THESE EXAMS!!!!!!! THEY START WEDNESDAY AND END FRIDAY SO WE DONT EVEN GET THAT MUCH TIME ON THEMAND ITS CRAZYYYYYYYYYY
Mathematics
1 answer:
zysi [14]3 years ago
5 0

Answer:

id be happy to help, what grade level so i can prepare?

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According to an​ article, 47​% of adults have experienced a breakup at least once during the last 10 years. Of 9 randomly select
In-s [12.5K]

Answer:

a) P(X=5)=(9C5)(0.47)^5 (1-0.47)^{9-5}=0.228

b) P(X=0)=(9C0)(0.47)^0 (1-0.47)^{9-0}=0.0033

And replacing we got:

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

c) P(X=4)=(9C4)(0.47)^4 (1-0.47)^{9-4}=0.257

P(X=5)=(9C5)(0.47)^5 (1-0.47)^{9-5}=0.228

P(X=6)=(9C6)(0.47)^6 (1-0.47)^{9-6}=0.135

And adding we got:

P(4 \leq X \leq 6)= 0.257+0.228+0.135=0.620

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Solution to the problem

Let X the random variable of interest, on this case we now that:

X \sim Binom(n=9, p=0.47)

The probability mass function for the Binomial distribution is given as:

P(X)=(nCx)(p)^x (1-p)^{n-x}

Where (nCx) means combinatory and it's given by this formula:

nCx=\frac{n!}{(n-x)! x!}

Assuming the following questions:

a. exactly five

For this case we can use the probability mass function and we got:

P(X=5)=(9C5)(0.47)^5 (1-0.47)^{9-5}=0.228

b. at least one

For this case we want this probability:

P(X \geq 1)

And we can use the complement rule and we got:

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

P(X=0)=(9C0)(0.47)^0 (1-0.47)^{9-0}=0.0033

And replacing we got:

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

c. between four and six, inclusive.

For this case we want this probability:

P(4 \leq X \leq 6)

P(X=4)=(9C4)(0.47)^4 (1-0.47)^{9-4}=0.257

P(X=5)=(9C5)(0.47)^5 (1-0.47)^{9-5}=0.228

P(X=6)=(9C6)(0.47)^6 (1-0.47)^{9-6}=0.135

And adding we got:

P(4 \leq X \leq 6)= 0.257+0.228+0.135=0.620

6 0
3 years ago
The area of a rectangle is 42 square inches and one side is 12 inches long find the perimeter of the rectangle
valentinak56 [21]

31,

because when you divide 42 and 12 to get the other two sides you get 3.5 and

3.5+3.5+12+12=31

3 0
3 years ago
What is the value of x in the equation 5x+3 - 4x?
Dafna1 [17]

5x + 3 - 4x = 0

x + 3 = 0

x = -3

Hope this helps :)

6 0
3 years ago
HOW DO U FIND <img src="https://tex.z-dn.net/?f=3X-4%3D12Y-3" id="TexFormula1" title="3X-4=12Y-3" alt="3X-4=12Y-3" align="absmid
rewona [7]
The answer is 1 please give brainliest answer! If you do I’ll show you the most amazing app ever
3 0
3 years ago
Luke invited 20 more boys than girls to his birthday party. However, only ¾ of the boys and ⅔ of the girls came. Exactly 19 of L
sveta [45]

Answer:

68

Step-by-step explanation:

Let:

Number of girls invited = x

Number of boys = x +20

3/4 of boy showed up

2/3 of girls showed up

Exactly 19 did not show up

Therefore, we could say:

Fraction of boys that didn't show up = 1 - 3/4 = 1/4

Fraction of girls that didn't show up = 1 - 2/3 = 1/3

That is,

[1/4 *(x + 20)] + [1/3*x] = 19

[(x + 20) / 4] + x /3 = 19

(3(x + 20) + 4x) / 12 = 19

3x + 60 + 4x = 228

7x = 228 - 60

7x = 168

x = 168 / 7

x = 24

Number of girls, x = 24

Number of boys, x + 20 = 24 + 20 = 44

Total friends invited = (24 + 44) = 68

8 0
2 years ago
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