Intro to Stats

What is the mean?

• The value that occurs the most often in a data set

• The sum of all numbers in a data set divided by the size

• The middle number in an ordered data set

• The sum of the greatest and least elements, divided by two

The heights of six students in a class are listed below:

158cm 172cm 164cm

164cm 167cm 159cm

However, there were actually seven students in the class, and the mean height in the class was 168 cm. What was the height of the unknown student?

On a container ship there were 30 small containers that each weighed 4 tons, 20 medium containers that each weighed 5 tons, and 10 large containers that each weighed 8 tons. Find the mean weight of the containers of this ship.

Round to the nearest tenth.

Roger bowled 7 games last weekend. His scores are: 148, 165, 138, 145, 127, 193, and 172. What was Roger's median score?

Paulo got these scores in three tests: 72, 80 and 82. He had one more test to take. He wants to make an average of 71 for the four tests. What must Paulo get on his fourth test?

The heights of some students are given.

158cm 121cm 164cm

164cm 167cm 155cm

What is the range of the heights?

What do you do if there are two numbers in "the middle" when you are finding the median?

• Pick your favorite number

• None of these

• They are both the median

• Add the two numbers in the middle and then divide by two

How many students were surveyed to collect this data?

• 11

• 13

• 15

• 17

Complete the frequency table. What is the highest frequency amount?

Which school won less than 44 medals?

• A

• B

• C

• D