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vodka [1.7K]
3 years ago
10

15 is what percent of 40?

Mathematics
1 answer:
bekas [8.4K]3 years ago
5 0
Divide 15 by 40 to get the percent and that tells you that its 0.375 once you have that you move the decimal 2 spots to the left to get 37.5%
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Kara’s car used 1/16 gallons of gas to drive 1/8 of a mile at this rate how many miles can Kara’s car drive using one gallon of
marissa [1.9K]
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Hope this helps
8 0
2 years ago
A random sample of n = 45 observations from a quantitative population produced a mean x = 2.5 and a standard deviation s = 0.26.
oee [108]

Answer:

P-value (t=2.58) = 0.0066.

Note: as we are using the sample standard deviation, a t-statistic is appropiate instead os a z-statistic.

As the P-value (0.0066) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the population mean μ exceeds 2.4.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that the population mean μ exceeds 2.4.

Then, the null and alternative hypothesis are:

H_0: \mu=2.4\\\\H_a:\mu> 2.4

The significance level is 0.05.

The sample has a size n=45.

The sample mean is M=2.5.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=0.26.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{0.26}{\sqrt{45}}=0.0388

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{2.5-2.4}{0.0388}=\dfrac{0.1}{0.0388}=2.58

The degrees of freedom for this sample size are:

df=n-1=45-1=44

This test is a right-tailed test, with 44 degrees of freedom and t=2.58, so the P-value for this test is calculated as (using a t-table):

P-value=P(t>2.5801)=0.0066

As the P-value (0.0066) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the population mean μ exceeds 2.4.

7 0
3 years ago
What number is 80% of 90?
Lerok [7]
The answer is 72

b/c 80% is equal to .80 

so you do 90x.80
4 0
3 years ago
If the price of a purse went from $45 to $54, what was the percent of the change?
NARA [144]
I think the answer is 17%
7 0
3 years ago
Find the distance between the points given<br> (0, -6) and (9,6)
Oduvanchick [21]

Answer:

(9,12)

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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