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Vlada [557]
2 years ago
7

In a class there are 15 boys and 15 girls 5/6 of the children have brown hair if someone is chosen at random what is the probabi

lity that they will not have brown hair
Mathematics
1 answer:
Cloud [144]2 years ago
6 0

Probability someone chosen at random will not have brown hair = 1/6

<h3>Probability of two variables</h3>

The number of girls = 15

The number of boys = 15

The total number of children = 15 + 15 = 30

Probability that someone chosen at random will have a brown hair, P(Brown hair) = 5/6

P(Brown hair) + P(Not Brown hair) = 1

5/6  +  P(Not brown hair) = 1

P(not brown hair) = 1 - 5/6

P(not brown hair) = 1/6

Therefore, if someone is chosen at random, probability that they will not have brown hair = 1/6

Learn more on probability here: brainly.com/question/27899440

#SPJ1

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Please help. 10 points and brainliest.
Snezhnost [94]

Answer:

\frac{a^2}{b^2}

Step-by-step explanation:

Apply the exponent rule a^b*a^c=a^b+c to a

a^4*a^-^2=a^4^-^2=a^2

b^3a^2b^-^5

Apply the exponent rule to b

b^3*b^-^5=b^3^-^5=b^-^2

Apply the exponent rule a^-^b=\frac{1}{a^b}

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6 0
3 years ago
Factor the Polynomial by solving x^2 + bx + c = 0.<br><br> m^2 - mv - 56v^2
marissa [1.9K]

Factor the Polynomial by solving x^2 + bx + c = 0.

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Factor by grouping.

(m−8v)(m+7v).

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x=\frac{-a+\sqrt{a^{2-4c} } }{2} , x=\frac{-a-\sqrt{a^{2-4c} } }{2}

7 0
3 years ago
If 3/4 of a ton of sand covers 2/5 of a playground, how many tons of sand are required to cover the entire playground?
saw5 [17]
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3 years ago
An SRS of size 20 is drawn from a population that has a normal distribution. The sample has a mean of 122.5 and a standard devia
Tems11 [23]

Answer:

The value is  \sigma_{\= x} = 1.789

Step-by-step explanation:

From the question we are told that

   The sample size is  n =  20  

    The sample mean is \= x = 122.5

    The standard deviation is  s =  8

Generally the standard error of the mean is mathematically represented as

       \sigma_{\= x} =  \frac{s}{\sqrt{n} }

=>    \sigma_{\= x} =  \frac{8}{\sqrt{20 } }

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8 0
3 years ago
The area of the square
maria [59]

Answer:

length x width

Step-by-step explanation:

The formula for area of a square is A = lw

4 0
3 years ago
Read 2 more answers
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