德望學校 – S3數學 3A Chapter 6 Measures of Central Tendancy – CQ (13-18)

試卷答案:

1. a) a =2, b = 19
   or other reasonable asnwer, e.g. a=3, b=18; a=4, b=17 as long as : a < b and a + b = 21
   b) a = 6, b = 15
   c) No, I do not agree.  The mean time has been affected by extreme values of 30min for at least 1 people and thus it cannot represent the majority of people.
2. a) a = 8 and b = 9
   b) median = 47
   c) new mean = 55.75
   d) 10
3. a) a = 44, b = 22
   b) mean = 1.62
   c) new mean = 1.58
4. a) 4
   b) mean = 3
   c) 3
5. a) 61 – 75 min
   b) mean = 54.2 min
6. a) $100
   b) median.  It is not affected by extreme value.
7. a) weight mean score of Pinky = 7.2
   b) k = 6
8. a) 31
   b) The claim is disagreed.

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