Someone pls help! 3x ^2 and x = 10 pls help!

Mathematics

2 answers:

otez555 [7]2 years ago

7 0

Answer:

300

Step-by-step explanation:

Because of PEMDAS (Order of Operations), you would do the exponent first.

So, 3(x)^2 and 3(100)

Then you get 300

Hope this helps!

True [87]2 years ago

6 0

Answer:

300

Step-by-step explanation:

3(10^2)

3(100)

300

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Part a

For this case the claim is:

$\sigma >17500$

And that represent the alternative hypothesis.

Part b: Null and alternative hypothesis

On this case we want to check if the population deviation is higher than 17500, so the system of hypothesis would be:

Null Hypothesis: $\sigma \leq 17500$

Alternative hypothesis: $\sigma >17500$

Calculate the statistic

For this test we can use the following statistic:

$\chi^2 =\frac{n-1}{\sigma^2_0} s^2$

And this statistic is distributed chi square with n-1 degrees of freedom. We have eveything to replace.

$\chi^2 =\frac{136-1}{17500^2} 18500^2 =150.869$

Step-by-step explanation:

Notation and previous concepts

A chi-square test is "used to test if the variance of a population is equal to a specified value. This test can be either a two-sided test or a one-sided test. The two-sided version tests against the alternative that the true variance is either less than or greater than the specified value"

$n=136$ represent the sample size