Prelim Standard 2 Exploring and Describing Data 2

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The mean of a set of three scores is 11. A fourth score is included. The new mean of the four scores is 10. What was the fourth score?

1 point

–1

–9

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The back−to−back stem and leaf plot displays the results of 10M RED and 10M BLUE in the same Mathematics test. Which statement is NOT true:

1 point

Data for 10M BLUE is negatively skewed.

The median of 10M RED is 54.

The range for 10M RED is 49.

The mean for 10M BLUE is higher than the mean of 10MRED

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Clare tabulated the times taken for 200 cars to cover a 400 m stretch on a local highway.Her results are shown in the table below. he standard deviation of the scores was closest to which of the following?

1 point

15.13

5.12

11.03

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A set of 13 scores has a median of 11. The scores 6, 7, 12 and 18 are added to the data set. Which of the following summary statistics is unaffected?

1 point

interquartile range

median

mean

standard deviation

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A group of six students completed a test. The mean for the group on this test was 15. However, one of the scores had been incorrectly recorded as a 10 instead of 20. What is the correct mean?

1 point

13.3

14.2

16.7

18.3

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The stem-and-leaf plot shows the number of goals scored by a team in each of ten netball games. What is the mode of this dataset?

1 point

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Calculate the interquartile range for the following data set 12, 23, 31, 46, 47, 53, 55, 65, 66, 70

1 point

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A set data has the following scores:

13, 15, 15, 15, 21, 23, 25, 30, 30, 33

What is the mode?

1 point

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