Statistics 1

What is the variance of the data below?

3 4 1 8 5 5 2

• 2.1

• 2.2

• 2.3

• 4.5

• 4.6

Find the correlation of the data.

• -0.0182

• -0.0194

• 4.4452

• 4.9699

• 9.4514

The temperature in degree Celcius, at midday in Copenhagen during summer of 2011, were measured for eight days and the results are recorded below.

21 12 15 12 24 T 30 24

The mean temperature was found to be 21^oC.

Find the median temperature.

• 18

• 21

• 22.5

• 24

• 27

The cumulative frequency curve for this data is shown.

Find the percentage of students with heights less than 165 cm.

• 26%

• 28%

• 30%

• 32%

• 34%

An analysis was undertaken of the weight of new cars sold during one particular month. To aid in the calculation, 5000 kg was subtracted from every data value, and each result divided by 200. The mean of these new values was 9.6. Find the actual mean weight of the new cars sold.

• 1920

• 6920

• 48000

• 48200

• 49920

An analysis was undertaken of the weight of new cars sold during one particular month. To aid in the calculation, 5000 kg was subtracted from every data value, and each result divided by 200. The standard deviation of these new values was 2.15. Find the standard deviation of the new cars sold.

• 430

• 5430

• 10750

• 10950

• 11180

A group of students was given an English test and was graded out of 20. Above is the distribution of the marks obtained.

Find the mode.

• 13

• 14

• 15

• 16

• 17

A group of students was given an English test and was graded out of 20. Above is the distribution of the marks obtained.

Fifty more students from different classes had a mean mark of 17.16 on the same test. Calculate the mean of the entire students.

• 15.23

• 15.35

• 15.69

• 15.87

• 15.91

A group of students was given an English test and was graded out of 20. Above is the distribution of the marks obtained.

Find the interquartile range.

• 2.5

• 3

• 3.5

• 4

• 4.5

Which one of these statistics measurements is not affected by outliers?

• Mean

• Range

• Variance

• Standard Deviation

• Interquartile range