IXL | Make inferences from multiple samples

The town of Crystal Palms is considering building a public swimming pool. The members of the town council each randomly survey 20 residents to see if there is enough support for the pool.

Here are the data from one council member's survey, with Yes indicating support for the pool and No indicating no support:

Yes	12
No	5
Undecided	3

What percentage of those surveyed support building the swimming pool?

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Learn with an example

question

This month, the Tinsville Petting Zoo is trying to determine how long guests stay when they visit the zoo. Employees randomly survey 12 guests each day as they exit about how many hours they spent at the zoo that day.

Here are the data for one day:

1.5

3.5

1.5

2.5

3.5

What is the mean number of hours guests in this survey spent at the petting zoo?

hours

key idea

The mean is one way to measure the center of a data set. To calculate the mean, or average, add all of the numbers in the data set and then divide by the number of values in the set.

solution

To find the mean number of hours spent at the petting zoo for this day's responses, first consider the data.

1.5

3.5

1.5

2.5

3.5

Then, calculate the mean. Notice that there are 12 values, so you need to divide by 12.

1.5

3.5

1.5

2.5

3.5

2.5

So, the mean number of hours spent at the petting zoo for this day's responses is

2.5.

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Teacher tools

Work it out

Not feeling ready yet? These can help:

HH.1Calculate mean, median, mode, and range

HH.New!Make an estimate from sample data

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