3 years ago

I NEED HELP PLEASE :(

Mathematics

1 answer:

UNO [17]3 years ago

5 0

There u go I hope this helps

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Which expression is equivalent to negative one half open parentheses three minus two fifths close parentheses?

kondor19780726 [428]

The answer is negative three halves minus one fifth

4 0

3 years ago

Read 2 more answers

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.8 parts

Alexxandr [17]

Answer:

The value of the test statistic is $t = 2.67$

Step-by-step explanation:

The null hypothesis is:

$H_{0} = 7.8$

The alternate hypotesis is:

$H_{1} \neq 7.8$

Our test statistic is:

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

In this problem, we have that:

$X = 8.2, \mu = 7.8, \sigma = 0.6, n = 16$

Then

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$t = \frac{8.2 - 7.8}{\frac{0.6}{\sqrt{16}}}$

$t = 2.67$

The value of the test statistic is $t = 2.67$

5 0

3 years ago

24 students and Jamal's class are wearing tennis shoes there are 30 students in this class your mom says that 70% of this class

mel-nik [20]

Im not sure if i am understanding the question correctly...

If you are asking if Jama's mom is correct, then no. she is wrong. this is because

if you take the proportion, (is/of)=(%/100) you get (x/30)=(70/100). You then solve for x which in this case would be 21 students are wearing tennis shoes.

Hope this helps.

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3 years ago

What does 5/9-1/12 equal to?

Elena-2011 [213]