O-LevelMathematicsStatistics4024/12 · May/June 2019 · Q33 Marks
The height of water, in cm, in a river is recorded every week for 10 weeks. The heights of the water, compared with its normal level, are listed below. -45 -30 -35 0 5 -10 -20 40 20 25
- (a)Work out the range.[1]
- (b)Calculate the mean.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [1] (a) 85
- [2] (b) -5
- [B1] for -50 seen
- [M1] for (-45-30-35+0+5-10-20 + 40 + 20 + 25) ÷ 10 oe
- [SC1] If 0 scored, SC1 for answer 5
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