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2 years ago

SOMOEN DELETED ALL MY ASNWERS NOW I ONLY HAVE 13 POINTS WHY WHY WHYYYYYYYYY

Mathematics

1 answer:

Vedmedyk [2.9K]2 years ago

7 0

Answer:

Maybe its because you give useless answers to get points.

Idiot.

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Niki wants to buy a dog bed the cost $87. She earns $6 per week for doing chores. How many weeks will Niki have to do her chores

Viktor [21]

Answer:

The answer to your question is 14.5 weeks

Step-by-step explanation:

Data

Total cost = C = $87

money earned = m = $6

Number of weeks to have the money = w = ?

Process

1.- Write an equation that represents the situation

Weeks = Total cost / Money earned

w = C/m

2.- Substitute the values

w = 87 / 6

3.- Result

w = 14.5

4.- Conclusion

Niki will last 14.5 weeks to have enough money to buy a dog bed.

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2 years ago

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LekaFEV [45]

Answer:

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Step-by-step explanation:

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3 years ago

Why are plus and minus signs ignored in percent error calculations?

inna [77]

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2 years ago

A manufacturer samples 100 wires for quality testing. Four of the wires are found to be defective. If 750 wires are produced in

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3 years ago

Read 2 more answers

There is a bag filled with 3 blue and 4 red marbles.

tresset_1 [31]

Using the hypergeometric distribution, it is found that there is a 0.4286 = 42.86% probability of getting 2 of the same colour.

The marbles are chosen without replacement, hence the <em>hypergeometric </em>distribution is used to solve this question.

<h3>What is the hypergeometric distribution formula?</h3>

The formula is:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}$

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

The parameters are:

x is the number of successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

In this problem:

There is a total of 3 + 4 = 7 marbles, hence N = 7.

Of those, 3 are blue, hence k = 3.

2 marbles will be taken, hence n = 2.

The probability of getting 2 of the same colour is the sum of P(X = 0), which is both red, with P(X = 2), which is both blue, then:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}$

$P(X = 0) = h(0,7,2,3) = \frac{C_{3,0}C_{4,2}}{C_{7,2}} = 0.2857$

$P(X = 2) = h(2,7,2,3) = \frac{C_{3,2}C_{4,0}}{C_{7,2}} = 0.1429$

Hence:

$p = P(X = 0) + P(X = 2) = 0.2857 + 0.1429 = 0.4286$

0.4286 = 42.86% probability of getting 2 of the same colour.

You can learn more about the hypergeometric distribution at brainly.com/question/4818951

3 0

2 years ago