All categories

4 years ago

I just want to know if I'm correct on that question.

Mathematics

1 answer:

Anni [7]4 years ago

5 0

I did the same thing you did ... I added up the "scores" column
and divided the total by 5 . That answer is 2 .

Then I read what you said about the answer sheet, so I went back
and looked at the problem again. Good thing I did. You have to look
and see what the first column says, and what it means.

There are FIVE different students who each scored 4.
There are THREE different students who each scored 3.
There are FOUR different students who each scored 2.
.
.
etc.

The total of all the scores is 44, not 10.
The total number of students is 20, not 5.

That's where the "2.2" comes from.

You might be interested in

Your neighbor has decided to enlarge his garden. The garden is rectangular with width 6 feet and length 15 feet. The new garden

Nana76 [90]

Answer:

Original garden: 42 feet

Enlarged garden: 98 feet

Step-by-step explanation:

Perimeter = length (2) + width (2)

Original perimeter:

P = 15(2) + 6(2)

P = 30 + 12

P = 42 feet

In this problem, similar is proportional, so the new garden will be proportional to the old one.

If the original length was 15 and the new length is 35, then 15 would have had to have been multiplied by 2 1/3. That means you need to multiply 6 by 2 1/3, which is 14. That means the dimensions of the enlarged yard is 14 (width) × 35 (length).

Enlarged perimeter

P = 35(2) + 14(2)

P = 70 + 28

P = 98 feet

4 0

4 years ago

Solve for x and y 14x+4y=210

Andru [333]

Answer:

x=15 and y =52.5

Step-by-step explanation:

x equals 210/14 which is 15 and y equals 210/4 which is 52.5. I hope I helped you and made your day a little better : )

8 0

3 years ago

Two angles are supplementary if their sum is 180 degrees

maksim [4K]

Answer:

maybe 80 degrees and 100? might be wrong dont count on me fully

Step-by-step explanation:

8 0

2 years ago

The average maximum monthly temperature in Campinas, Brazil is 29.9 degrees Celsius. The standard deviation in maximum monthly t

kvv77 [185]

Answer:

$P(X>32)=P(\frac{X-\mu}{\sigma}>\frac{32-\mu}{\sigma})=P(Z>\frac{32-29.9}{2.31})=P(z>0.909)$

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

$P(z>0.909)=1-P(z$

And if we convert this to a % we got 18.2 % of maximum temperatures higher or equal than 32 C

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".

Solution to the problem

Let X the random variable that represent the maximum monthly temperature of a population, and for this case we know the distribution for X is given by:

$X \sim N(29.9,2.31)$