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julia-pushkina [17]

3 years ago

8

Un sastre vende dos camisas a S/. 60 cada una. En la primera camisa gana 25% de lo que costo hacerla y en la otra pierde 25% de

su costo. ¿Gano o perdió en la venta? ¿Cuánto?

1 answer:

weeeeeb [17]3 years ago

5 0

Me no speak espanol i thivcyieuqo

Step-by-step explanation:

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Suppose the time a child spends waiting at for the bus as a school bus stop is exponentially distributed with mean 7 minutes. De

Gala2k [10]

Answer:

The probability that the child must wait between 6 and 9 minutes on the bus stop on a given morning is 0.148.

Step-by-step explanation:

Let the random variable <em>X</em> represent the time a child spends waiting at for the bus as a school bus stop.

The random variable <em>X</em> is exponentially distributed with mean 7 minutes.

Then the parameter of the distribution is, $\lambda=\frac{1}{\mu}=\frac{1}{7}$ .

The probability density function of <em>X</em> is:

$f_{X}(x)=\lambda\cdot e^{-\lambda x};\ x>0,\ \lambda>0$

Compute the probability that the child must wait between 6 and 9 minutes on the bus stop on a given morning as follows:

$P(6\leq X\leq 9)=\int\limits^{9}_{6} {\lambda\cdot e^{-\lambda x}} \, dx$

$=\int\limits^{9}_{6} {\frac{1}{7}\cdot e^{-\frac{1}{7} \cdot x}} \, dx \\\\=\frac{1}{7}\cdot \int\limits^{9}_{6} {e^{-\frac{1}{7} \cdot x}} \, dx \\\\=[-e^{-\frac{1}{7} \cdot x}]^{9}_{6}\\\\=e^{-\frac{1}{7} \cdot 6}-e^{-\frac{1}{7} \cdot 9}\\\\=0.424373-0.276453\\\\=0.14792\\\\\approx 0.148$

Thus, the probability that the child must wait between 6 and 9 minutes on the bus stop on a given morning is 0.148.

6 0

3 years ago

Can someone plz help me ASAP thxs

allsm [11]

Answer:

352

Step-by-step explanation:

8 x 6 x 8 = 384

384- (4 x 1 x 8)

384-32=352

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The value of a movie poster is increasing at a rate of 3.5% per

Bingel [31]

Answer:

44.55

Step-by-step explanation:

I actually didn't get the right answer and I just edited it right now I'm sorry I dont have an explanation!

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Plzzzzz help I need

Lera25 [3.4K]

Answer:

i dont know tbh

Step-by-step explanation:

good luck

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Find the value of x.

mamaluj [8]

Answer:

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