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IgorC [24]
3 years ago
9

Last year 762 students voted in the student council election at San Bruno Middle School this year 721 students voted to the near

est tenth what was the percent of change in the number of students that voted
Mathematics
1 answer:
Soloha48 [4]3 years ago
5 0

Answer:

Percent change = 5.4%

Step-by-step explanation:

Given:

Number of students voted last year = 762

Number of students voted this year = 721

Change in the number of students who voted from last year to this year is given by the difference of their number. This gives,

Change in the number of students that voted = 762 - 721 = 41

Now, percentage change in the number of students that voted is given as:

\textrm{Pecent change}=\frac{\textrm{Change in number}}{\textrm{Number last year}}\times 100\\\\\textrm{Pecent change}=\frac{41}{762}\times 100\\\\\textrm{Pecent change}=\frac{4100}{762}=5.38\%\approx 5.4\%

Therefore, the percent change in the number of students that voted is 5.4%.

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Suppose that a standardized biology exam has a mean score of 80% correct, with a standard deviation of 3. The school administrat
NemiM [27]

Answer:

The 99% confidence interval is between 62.36%(lower bound) and 89.64%(upper bound).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

A sample of 65 students from the freshmen class is used and a mean score of 76% correct is obtained.

This means that n = 65, \pi = 0.76

99% confidence level

So \alpha = 0.005, z is the value of Z that has a pvalue of 1 - \frac{0.005}{2} = 0.995, so Z = 2.575.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.76 - 2.575\sqrt{\frac{0.76*0.24}{65}} = 0.6236

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.76 + 2.575\sqrt{\frac{0.76*0.24}{65}} = 0.8964

0.6236*100 = 62.36%

0.8964*100 = 89.64%

The 99% confidence interval is between 62.36%(lower bound) and 89.64%(upper bound).

6 0
3 years ago
Nine more than the product of -8 and a number is -7
Yanka [14]

Answer:

-9

Step-by-step explanation:

5 0
3 years ago
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How many ms in a second?
professor190 [17]
1000. its making me type more stuff

4 0
2 years ago
Solve -9/2y = 27/2 for y
slavikrds [6]

Answer: y = -3

I hope this helps you


4 0
3 years ago
The sum of a number is<br> 4 less then 2 times a<br> number is 35 what is the number?
Artist 52 [7]
<h2>Answer:</h2>

<em>21.5</em>

<h2>Step-by-step explanation:</h2>
  1. 35 divided by 2 = 17.5
  2. 17.5 + 4 = 21.5
  3. <u>Just do the inverse</u>
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3 years ago
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