Formulae/Concepts Needed:
> mean and median
> range
> variance and standard deviation
> quartiles and interquartile range
Here is the copy of the practice exercises on Measures of Central Location and Measures of Variation [Part 2]. The file contains five (10) items. It contains:
- Formulas needed
- Items requiring different formulas
You may download the complete copy of the past paper items here (click the image below):
You also want to try the previous set of past papers on Measures of Central Location and Variation [Part 1] here (click on the image below):
Your comments and suggestions are welcome here. Write them in the comment box below. Thank you and God bless!
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ANSWER KEY:
ReplyDelete1)(ii) median = 19, Q1 = 10, Q3 = 24, IQR = 14
2)(i) median = 138.75, sd = 83.1
(ii) Team B, smaller sd
3)(ii)new time = 15.6
4)(i)sd = 0 so all rides cost the same
(ii) sd = 1.03
5)(i)t=9
(ii)sd = 16.1
6)(i)mean = 18.4, sd = 13.3
7) t=18.2, sd = 4.19
8)(i)mean = 63.5
(ii) Sigma(x - 50) = 945
Sigma (x -50)^2 = 20 623
9)(i)a = 12
(ii) sd = 8.88
10)(i) mean = 44.1
(ii) sd = 14.0