Short Quiz

Question 1 of 5

Ten wrestlers have mean weight 39.2 kg. Nine recorded weights total 349 kg. What is the missing weight?

A 43 kg B 39.2 kg C 41 kg D 45 kg

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Question 2 of 5

Use the sleep-duration graph.

During which broad age interval is the plotted average closest to its minimum?

A About 30-50 years B About 6-10 years C About 60-75 years D It is constant at every age

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Question 3 of 5

The three plots show song lengths in minutes.

Which plot has mean about 5.57 minutes?

A Plot B B Plot A C Plot C D All three

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Question 4 of 5

Every value in a data set with mean \(m\) is multiplied by 3. What is the new mean?

A \(m+3\) B \(m\) C \(3m\) D \(m/3\)

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Question 5 of 5

Which expression gives the mean when values \(x_i\) have frequencies \(f_i\)?

A \(\dfrac{\sum x_i f_i}{\sum f_i}\) B \(\dfrac{\sum x_i}{\sum f_i}\) C \(\sum x_i f_i\) D \(\dfrac{\sum f_i}{\sum x_i}\)

Select one option. Answers are shown after the test.

Class 6