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2 years ago

8

A student earned a grade of 80% on a math text that had 20 problems. How many problems on this test did the student answer corre

ctly?

1 answer:

mars1129 [50]2 years ago

7 0

The student got 16 problems correct.

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In the U.S., 95% of children have received their DTaP vaccine. Calculate the probability that fewer than 700 out of a sample of

Studentka2010 [4]

Answer:

0.0183

Step-by-step explanation:

The percentage of students, who received their DTaP vaccine is 95%.

This implies that:

$p = 0.95$

and

$q = 1 - 0.95 = 0.05$

The standard deviation of the proportion is

$= \sqrt{ \frac{pq}{n} }$

$= \sqrt{ \frac{0.95 \times 0.05}{750} } \\ = 0.00796$

We want to find the probability, that the sample proportion,

$\hat p \leqslant \frac{700}{750} \\ \hat p \leqslant 0.9 \bar3$

$P(\hat p\le0.9\bar3)=P(Z\le \frac{0.9 \bar3 - 0.95 }{0.00796} ) \\ = P(Z\le - 2.09) \\ = 0.0183$

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2 years ago

There are 10 balls in a bag numbered from 1 to 10. Three balls are selected at random without replacement.

VikaD [51]

Answer:

A=1000

B=3.33

Step-by-step explanation:

I think?

6 0

1 year ago

456 students participate in and switch day the students raise money for charity so that the principle approve the day if you tur

alexandr402 [8]

Answer: The amount of money each student raised = $2

Step-by-step explanation:

Given : In charity

Total students participate= 456

Total collection = $912

Each student brought in the same amount of money , then the amount each student raised = $\dfrac{\text{Total collection }}{\text{Total students}}$

$=\$\dfrac{912}{456}\\\\=\$2$

Hence, the amount of money each student raised is $2.

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2 years ago

What is the solution to the system of equations. 2x-y=7 y=2x+3

OLEGan [10]

To solve this, you can substitute the second equation into the first.

It becomes 2x-(2x+3)=7

Solve from here!

You get -3=7. Not possible. Therefore there is no solution to this system.

System is inconsistent. Hope this helps.

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3 years ago

Is 5/8 closer to 0,1/2, or 1 and why

Musya8 [376]

It is closer to 1/2 because 5/8 is close to 4/8 which is 1/2.

3 0

3 years ago