Carla has a list of all 720 students in her middle school. She writes the name of each student on a slip of paper and puts each slip in a box. Then she pulls out 30 names from the box to decide who she will survey about the upcoming school election. How many students are in Carla's Sample?

Step-by-step explanation:

Given that,

Clara has a list of 720 names

She decided to survey 30 names from the sample.

It is very straight forward, there are 30 names in Clara sample

But this sample can be use to generalize the overall population of 720 students if they are given equal chances of being selected maybe by taking a survey or picking their names randomly from a box

If it not a biased sample then we can use the survey to generalized the overall population

So, there are 720 names in Clara's sample

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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9 x 8 divided by (5-3)=36