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4 years ago

Please help me asap!!!

Mathematics

1 answer:

Anastasy [175]4 years ago

6 0

Answer:

C) 75

Step-by-step explanation:

I got this because what you have to do, they all have to add up to 180. so what you do is:

2x + 30 = 180

-30 -30

2x = 150

2x/2 = 150/2

x = 75

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Let X be a Binomial Random Variable with 8 trials and a probability of success as 0.37. Suppose you want to find k such that P(X

larisa86 [58]

Answer:

k = 4

Step-by-step explanation:

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

In this problem we have that:

$n = 8, p = 0.37$ . So

P(X < k) = 0.6625

k only assumes discrete values, so

$P(X < k) = P(X \leq k-1) = 0.6625$

We have to find the cummulative distribution until we hit 0.6625. So

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 0) = C_{8,0}.(0.37)^{0}.(0.63)^{8} = 0.0248$

$P(X \leq 0) = P(X = 0) = 0.0248$

$P(X = 1) = C_{8,1}.(0.37)^{1}.(0.63)^{7} = 0.1166$

$P(X \leq 1) = P(X = 0) + P(X = 1) = 0.0248 + 0.1166 = 0.1414$

$P(X = 2) = C_{8,2}.(0.37)^{2}.(0.63)^{6} = 0.2397$

$P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2) = 0.0248 + 0.1166 + 0.2397 = 0.3811$

$P(X = 3) = C_{8,3}.(0.37)^{3}.(0.63)^{5} = 0.2814$

$P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) = 0.0248 + 0.1166 + 0.2397 + 0.2814 = 0.6625$

$P(X \leq 3) = P(X < 4) = 0.665$

So k = 4

7 0

3 years ago

If you answer this correctly you get a cookie

avanturin [10]

Answer:

3/9

Step-by-step explanation:

P(G,G) = 1/3 × 1/3 = 1/9

P(B,B) = 1/9

P(Y,Y) = 1/9

P(same colour) 1/9 + 1/9 + 1/9 = 3/9

8 0

3 years ago

The walls in a room are being painted. If 4 cans cover 480 sq ft then how many cans cover 840 sq ft?

solong [7]

Answer:

7 cans

Step-by-step explanation:

You will first have to divide 480 by 4

The anwser is 480 ÷ 4 = 120

Then you will have to 840 ÷ 120 = 7

<h2>The answer is 7 cans </h2>

5 0

3 years ago

Read 2 more answers

Helpppppp meeeeee!!!

Rufina [12.5K]

The answer is A. -8 I got you!!!!!

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3 years ago

Twenty three point four divided by six=

Vinvika [58]

Answer:

3.9

Step-by-step explanation:

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3 years ago