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uranmaximum [27]
3 years ago
15

30 students went on the school trip. If the total cost of the trip was $805.50.How much money does each student need to contribu

te
Mathematics
1 answer:
enot [183]3 years ago
7 0

Answer:

$26.85 per student

Step-by-step explanation:

805.50 / 30 = 26.85 per student

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A nurse is investigating the birth weights of​ non-premature babies. She selects a random sample of 41 such​ babies, and found a
kherson [118]

Answer:

The 95​% confidence interval for the mean birth weight of all ​non-premature babies is between 3350.4 grams and 3662.4 grams. This means that we are 95% sure that true mean birth weight of all non-premature babies is in this interval.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 41 - 1 = 40

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 40 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.0211

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.0211\frac{494.2}{\sqrt{41}} = 156

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 3506.4 - 156 = 3350.4 grams

The upper end of the interval is the sample mean added to M. So it is 3506.4 + 156 = 3662.4 grams

The 95​% confidence interval for the mean birth weight of all ​non-premature babies is between 3350.4 grams and 3662.4 grams. This means that we are 95% sure that true mean birth weight of all non-premature babies is in this interval.

6 0
3 years ago
What is the domain of the function represented by the graph?
ioda

Answer:

c

Step-by-step explanation:

because mathematically 0 less than or equal to x less than or equal to 4 means starting from 0 up to 4 is the domain of the graph

but if we were asked about the range it was going to be all real number (B) because if the range means the value of y then y have solution in all the way down

please mark me brainliest

thanks for asking

8 0
2 years ago
Can someone help me with one of these or both ?
kifflom [539]

Answer: 280 for number 2

Step-by-step explanation: I think I ain’t not % sure

3 0
2 years ago
A publisher reports that 30% of their readers own a laptop. A marketing executive wants to test the claim that the percentage is
Ierofanga [76]

Answer:

Test statistic = - 2.29

Pvalue = 0.0110

Step-by-step explanation:

The hypothesis :

H0 : p = 0.3

H1 : p < 0.3

Test statistic :

z=pˆ−p/√p(1−p)/n

pˆ = 0.2

Z = (0.20 - 0.30) / √(0.30(1 - 0.30) / 110

Z = - 0.1 / √0.0019090

Z = - 0.1 / 0.0436931

Z = - 2.29

Test statistic = -2.29

The Pvalue :

P(Z < -2.29) = 0.0110

4 0
3 years ago
what is another way to change 4/5 *35=28? what is 28/ 4/5? what is 5 / 3/5?what is 35 / 4/5? And will brainly
geniusboy [140]
On my test the answer is A
3 0
3 years ago
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