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2 years ago

Help me PLEASEEEEEEEEEEEEE

Mathematics

1 answer:

steposvetlana [31]2 years ago

4 0

Answer: d

Step-by-step explanation:

its d

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Let x be the amount of time (in minutes) that a particular San Francisco commuter must wait for a BART train. Suppose that the d

larisa [96]

Answer:

a) $P(X$

$P(X>14) = 1-P(X$

b) $P(7< X$

c) We want to find a value c who satisfy this condition:

$P(x$

And using the cumulative distribution function we have this:

$P(x$

And solving for c we got:

$c = 20*0.9 = 18$

Step-by-step explanation:

For this case we define the random variable X as he amount of time (in minutes) that a particular San Francisco commuter must wait for a BART train, and we know that the distribution for X is given by:

$X \sim Unif (a=0, b =20)$

Part a

We want this probability:

$P(X$

And for this case we can use the cumulative distribution function given by:

$F(x) = \frac{x-a}{b-a} = \frac{x-0}{20-0}= \frac{x}{20}$

And using the cumulative distribution function we got:

$P(X$

For the probability $P(X>14)$ if we use the cumulative distribution function and the complement rule we got:

$P(X>14) = 1-P(X$

Part b

We want this probability:

$P(7< X$

And using the cdf we got:

$P(7< X$

Part c

We want to find a value c who satisfy this condition:

$P(x$

And using the cumulative distribution function we have this:

$P(x$

And solving for c we got:

$c = 20*0.9 = 18$

3 0

2 years ago

What is the equation of a line whose slope is 2 and passes through the point (-6,9)

yuradex [85]

Answer:

y = 2x + 21

Step-by-step explanation:

Step 1: Write out known variables

y = mx + b

m = 2

y = 2x + b

Step 2: Find b

9 = 2(-6) + b

9 = -12 + b

b = 21

Step 3: Rewrite linear equation

y = 2x + 21

7 0

2 years ago

The area of a sector of a circle is given by the equation uppercase A = StartFraction pi r squared uppercase S Over 360 EndFract

andreyandreev [35.5K]

Answer:360A/pi ^2

Step-by-step explanation:

4 0

3 years ago

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.......................help pls

Vinvika [58]

Answer:

The first one is incorrect

Step-by-step explanation:

3^2 - 5 + 2

9 - 5 + 2

4+2 = 6 (not 42)

4 0

3 years ago

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Profit is the difference between revenue and cost. The revenue, in dollars, of a company that manufactures televisions can be mo

Marrrta [24]

3x^2 + 180x - (3x^2 - 160x + 300) = profit
3x^2 + 180x - 3x^2 + 160x - 300 = profit
340x - 300 = profit

so if 150 televisions are sold...x = 150
340(150) - 300 =
50,700 <==

4 0

3 years ago

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