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3 years ago

In a family with four children, what is the probabaility that 3 are girls and one is a boy

1 answer:

4 0

If we write all the possible combinations for this problem, 4/16 or 1/4 would be the answer.

BGGG
GBGG
GGBG
GGGB

This is not taking into consideration the specific order of the children. In case the order will be necessary, the Girls need to be labeled differently and permutation formula needs to be used.

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I need help urgently please!!!!! Will absolutely mark the brainiest whoever answers this correctly!

yulyashka [42]

If i plug it into my calculator i get 9914 as my answer,

Explanation:
but if that’s not the right answer lmk and i can solve it a different way!

5 0

3 years ago

Is a power of <br><img src="https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B%20%5Cfrac%7B1%7D%7B2%7D%20%7D%20" id="TexFormula1" title="

Savatey [412]

No it is not. The 1/2 power is the equivalent to the square root, but it is not equivalent to dividing by 2.

3 0

3 years ago

In February, Alec had 1,568 visitors to his website. In March, he had 1,335 visitors to his website. What is the percentage decr

shusha [124]

Answer:7.5%

Step-by-step explanation:

decrease the number of visitors from Alec´s website from February to the next month.

4 0

3 years ago

The function C=120+.20m represents the cost see in dollars of renting a car after driving miles how many miles would a customer

faust18 [17]

Customer have to drive 100 miles for cost to be equal to $140

<u>Solution:</u>

Given function is as follows

C = 120 + 0.20m

Where "C" represents cost in dollar of renting a car and "m" represents number of miles.

If we see the given equation, we can say that fixed cost is 120 and variable cost is 0.20m which is dependent on number of miles car is driven.

We need to calculate number of miles so that total cost that is C = $140

On substituting C = $140 in given function, we get

140 = 120 + 0.20m

On Solving above equation for m we get

140 – 120 = 0.20m

=> 20 = 0.20m

=> $m = \frac{20}{0.20} = 100 miles$

Hence customer have to drive 100 miles for cost to be equal to $140.

4 0

3 years ago

Write out the following sums, one term for each value of k. Simplify each term as much as possible, but do not enter decimals. F

alukav5142 [94]

The correct question is:

Write out the following sums, one term for each value of k. Simplify each term as much as possible, but do not enter decimals. For example, enter 1 + 4 + 9 instead of 1² + 2² + 3² or 14, or enter 1/2 + 1/2 instead of 0.5 + 0.5 or 1.

The purpose of this problem is for you to show that you know how to interpret summation notation and write all of the terms in a sum, which is why you are being told not to reduce your answers very much.

$(a) \sum_{k=0}^5 2^k \\ \\(b) \sum_{k=2}^7 \frac{1}{k} \\ \\(c) \sum_{k=1}^5 k^2 \\ \\(d) \sum_{k=1}^6 \frac{1}{6} \\ \\(e) \sum_{k=1}^6 2k$

Answer:

$(a) \sum_{k=0}^5 2^k = $1 + 2 + 4 + 8 + 16 + 32$ \\ \\(b) \sum_{k=2}^7 \frac{1}{k} = \frac{1}{2} + \frac{1}{3} + \frac{1}{4}+ \frac{1}{5}+ \frac{1}{6}+ \frac{1}{7} \\ \\(c) \sum_{k=1}^5 k^2 = 1 + 4 + 9 + 16 + 25 \\ \\(d) \sum_{k=1}^6 \frac{1}{6} = \frac{1}{6} + \frac{1}{6} + \frac{1}{6} + \frac{1}{6} + \frac{1}{6} + \frac{1}{6} \\ \\(e) \sum_{k=1}^6 2k = 2 +4 +6 +8 +10 +12$

Step-by-step explanation:

$(a) \sum_{k=0}^5 2^k\\For k = 0: 2^k = 2^0 = 1\\For k = 1: 2^1 = 2\\For k = 2: 2^2 = 4\\For k = 3: 2^3 = 8\\For k = 4: 2^4 = 16\\For k = 5: 2^5 = 32\\\sum_{k=0}^5 2^k = 1 + 2 + 4 + 8 + 16 + 32$

$(b) \sum_{k=2}^7 \frac{1}{k}\\For k = 2: 1/2\\For k = 3: 1/3\\For k = 4: 1/4\\For k = 5: 1/5\\For k = 6: 1/6\\For k = 7: 1/7\\ \sum_{k=2}^7 \frac{1}{k} = 1/2 + 1/3 + 1/4 + 1/5 + 1/6+ 1/7$

$(c) \sum_{k=1}^5 k^2\\For k = 1: 1^2 = 1\\For k = 2: 2^2 = 4\\For k = 3: 3^2 = 9\\For k = 4: 4^2= 16\\For k = 5: 5^2 = 25\\\sum_{k=1}^5 k^2 = 1 + 4 + 9 + 16 + 25$

$(d) \sum_{k=1}^6 \frac{1}{6}\\For k = 1: 1/6\\For k = 2: 1/6\\For k = 3: 1/6\\For k = 4: 1/6\\For k = 5: 1/6\\For k = 6: 1/6\\ \sum_{k=1}^6 \frac{1}{6} = 1/6 + 1/6 + 1/6 + 1/6 + 1/6 + 1/6$

$(e) \sum_{k=1}^6 2k\\For k = 1: 2\times1 = 2\\For k = 2: 2\times2 = 4\\For k = 3: 2\times3 = 6\\For k = 4: 2\times4 = 8\\For k = 5: 2\times5 = 10\\For k = 6: 2\times6 = 12\\\sum_{k=1}^6 2k = 2 +4 +6 +8 +10 +12$

7 0

3 years ago