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2 years ago

7

On a quiz worth 5 points, three students earned a 5, five students earned a 4, four students earned a 3,six students earned a 2

, nine earned a 1 and eight students earned a zero . What is the class average on this quiz

1 answer:

iVinArrow [24]2 years ago

3 0

If you add them all together and divide the answer you get by 5 you should get 7

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An exponential random variable has a standard deviation of 16. Calculate The probability that it takes on a value < 11. Use 3

antiseptic1488 [7]

Answer:

$P(X$

And using the cdf we got:

$P(X$

Step-by-step explanation:

Previous concepts

The exponential distribution is "the probability distribution of the time between events in a Poisson process (a process in which events occur continuously and independently at a constant average rate). It is a particular case of the gamma distribution". The probability density function is given by:

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

And 0 for other case. Let X the random variable that represent the random variable of interest and we know that the distribution is given by:

$X \sim Exp(\lambda)$

We know the variance on this case given by :

$Var(X) = \frac{1}{\lambda^2}$

So then the deviation is given by:

$Sd(X) = \frac{1}{\sqrt{\lambda}}$

And if we solve for $\lambda$ we got:

$\lambda = (\frac{1}{16})^2 = \frac{1}{256}$

The cumulative distribution function for the exponential distribution is given by:

$F(x) = 1- e^{-\lambda x}$

Solution to the problem

And for this case we want to find this probability:

$P(X$

And using the cdf we got:

$P(X$

5 0

2 years ago

Best answer dets Brainliest!!!

Gala2k [10]

Plot the points at
(-9,-5)
And
(-3,-5)
This looks right

8 0

2 years ago

(pls this is the last one)Use the image below to find the experimental probability of rolling a number less than 7.

Leni [432]

Answer:

$\frac{6}{7}$

Step-by-step explanation:

For this problem, the fraction is out of 7 so all the values less than 7 is 1-6. So the probability is going to be $\frac{6}{7}$

Hope this helps.

6 0

2 years ago

Read 2 more answers

Hi! Can anyone answer this question? Please put your answer in a fraction =)

Andre45 [30]

Answer:
1/15

Explanation:

3 0

2 years ago

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Name the property shown by each statement.

vlada-n [284]

Most of these problems are the commutative property:

Addition
a + b = b + a

Multiplication
a * b = b * a

and the associative property:

Addition
(a + b) + c = a + (b + c)

Multiplication
(a * b) * c = a * (b * c)

There's also the Identity property:

Addition \ Subtraction:
a + 0 = a \ a - 0 = a

Multiplication \ Division:
a * 1 = a \ a / 1 = a

5 0

2 years ago