3 years ago

Destiny designs necklaces.

Mathematics

1 answer:

mixas84 [53]3 years ago

7 0

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The lifetime of a certain type of battery is normally distributed with mean value 11 hours and standard deviation 1 hour. There

victus00 [196]

Answer: The required lifetime value is 11.27.

Step-by-step explanation:

Since we have given that

Mean value = 11 hours

Standard deviation = 1 hour

The total lifetime of all batteries in a package exceeds that value for only 5% of all packages.

So, α = 0.95, z= 1.645

n = 9

So, the lifetime value would be

$x=\mu+z\times \dfrac{\sigma}{\sqrt{n}}\\\\x=11+1.645\times \dfrac{1}{\sqrt{36}}\\\\x=11+1.645\times \dfrac{1}{6}\\\\x=11.27$

Hence, the required lifetime value is 11.27.

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4 years ago

£6000 is to be shared among David, Daniel and Dennis, Daniel is to get one and a half times as much as David, while Denis is to

Elina [12.6K]

Answer:

Step-by-step explanation:

9+9+9+9=36 or 9 times 3

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3 years ago

A square has sides 5 inches long. what is the approximate length of a diagonal of the square?

Nina [5.8K]

Answer:

Step-by-step explanation:

5x4= 20

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3 years ago

<img src="https://tex.z-dn.net/?f=%20%28%7B3x%7D%5E%7B2%7D%20%20%2B%202x%20%2B%201%29%20%2B%20%28%20%7B2x%7D%5E%7B2%7D%20%20-%20

mafiozo [28]

Answer:

$5x^2+x-5$

Step-by-step explanation:

$(3x^2+2x+1)+(2x^2-4x-5)+(3x-1)= \\\\(3x^2+2x^2)+(2x-4x+3x)+(1-5-1)= \\\\5x^2+x-5$

Hope this helps!

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3 years ago

Gente me ajudem prfvv em matemática

Tasya [4]

Answer:

Step-by-step explanation:

Trace a linha de 8cm, daí você vai dividir ela no meio, ou seja, no 4. Aí é só contar 2 cm para cada lado, que vai ser o 1, as pontas vão ser o 2. Tendeu? Daí é só marcar os pontos no -3/7(~-2,3), 1,6, 7/5(1,4), -1 e 0

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2 years ago