Ask question

Ask question

All categories

3 years ago

15

emergency Alejandro has gone to school 5 Over 7 of the last 35 days. Which expression can be used to determine the number of day

s Alejandro has gone to school?

2 answers:

Yakvenalex [24]3 years ago

8 0

Answer:

245 days.

Step-by-step explanation:

Hope this helps.

Oksi-84 [34.3K]3 years ago

6 0

The answer is 245 days i’m pretty sure

You might be interested in

A researcher collected data from a sample of correctional officers and found that on average they made 47,173 dollars a year wit

ollegr [7]

Answer:

a) $z = \frac{40000- 47173}{6364} = -1.127$

b) $z = \frac{50000- 47173}{6364} = 0.444$

c) $P(X>40000)=P(\frac{X-\mu}{\sigma}>\frac{40000-\mu}{\sigma})=P(Z>\frac{40000-47173}{6364})=P(z>-1.127)$

And we can find this probability using the complement rule and the normal standard distribution or excel and we got:

$P(z>-1.127)=1-P(z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Part a

Let X the random variable that represent the amount of money of a population of interet, and we know the following info:

Where $\bar X=47173$ and $s=6364$

We can assume that the sample size is large and the estimators can be used as a good description for the parameters $\mu \sigma$

The z score for 40000 would be:

$z = \frac{40000- 47173}{6364} = -1.127$

Part b

The z score for 50000 would be:

$z = \frac{50000- 47173}{6364} = 0.444$

Part c

We are interested on this probability

$P(X>40000)$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(X>40000)=P(\frac{X-\mu}{\sigma}>\frac{40000-\mu}{\sigma})=P(Z>\frac{40000-47173}{6364})=P(z>-1.127)$

And we can find this probability using the complement rule and the normal standard distribution or excel and we got:

$P(z>-1.127)=1-P(z$

8 0

3 years ago

In which graph is y a linear function of x will mark brainiest

Nookie1986 [14]

Answer:

I think it is d

Step-by-step explanation:

hope this helps

6 0

3 years ago

Jewelers building a pen for her baby turtles. She wants the pain to be 30 in long and 45 in wide. What piece of wood will Jill n

musickatia [10]

135 I think just multiple 45x30

7 0

4 years ago

Desmond ordered his favourite pizza with 1 2 12 slices. Sadly, he could finish only 7 5 % 75% of the whole pizza. How many pizza

Gala2k [10]

Answer:

3 pizza slices.

Step-by-step explanation:

We have been given that Desmond ordered his favorite pizza with 12 slices. Sadly, he could finish only 75% of the whole pizza.

As Desmond ate 75% of 12 slices, so left number of slices will be equal to 25% of 12 slices.

$\text{Number of pizza slices left}=\frac{25}{100}\times 12$

$\text{Number of pizza slices left}=\frac{1}{4}\times 12$

$\text{Number of pizza slices left}=3$

Therefore, 3 pizza slices were left.

7 0

4 years ago

What is the value of the expression -c+(-d) when c=-3.5 and d= -12.8

g100num [7]

Answer:

16.3

Step-by-step explanation:

-(-3.5) + (-(-12.8))

3.5+12.8= 16.3

7 0

4 years ago