There are 550 students at green county middle school and 220 of them ride the bus to school. what percent of the students ride t
1 answer:
There are 550 students at the green country middle school and 220 of them ride the bus to school. What percent of the students ride the bus?
The fraction represents the number of students that ride the bus to school out of all the students.
To find what percent of students ride the bus to school, we can turn the fraction into a percent.
We can first reduce this fraction by dividing both the numerator and denominator by the Greatest Common Factor of 220 and 500 using 20.
220 ÷ 20 = 11
500 ÷ 20 = 25
11 ÷ 25 = 0.44
0.44 × 100 = 44%
Therefore, 44% of the students ride the bus to green country middle school.
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Answer:
She needs a sample of at least 385.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
95% confidence level
So , z is the value of Z that has a pvalue of
, so
.
How large a sample should she take to achieve this?
She needs a sample of size at least n.
n is found when M = 0.04.
We do not know the true population proportion, so we use , which is the case for which we are going to need the largest sample size.
Dividing both sides by 0.05
Rounding up
She needs a sample of at least 385.