Mrs Ely’s MYP 5 class sat a chemistry test which was out of 40 marks. The mean score was 32 marks and the standard deviation was 8 .
In order to change this to a mark out of 100, Mrs.
Mrs. Ely thinks that it would be all right to multiply all the scores by 2 and then add 20 to each one.
Mr. Ely thinks that it would be fairer to multiply all the scores by 2.5.
Miss Ely suggests multiplying by 3 and subtracting 20 from each score.
(a)Write down the new mean and the new standard deviation for each suggestion.
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Answer:
1736521
1, 736, 521
17, 36, 521
2638
2,6 38
2638
Hurma
1 1547
11547
11-547
742375
50 72
50 72
5072
4755
4 1 5 793
4 1 5 7 93
415793
9016
900354
900354
900354
225 74
3 2 4 7 6 5 4
3 2 4 7 6 5 4
3247654
4 1689
423 64
42 364
423 64
31226
6 6 6 6
6 6 6 6
66 66
28943
999999
999999
999999
6 7 8 431
1000000
1000000
1000000
884573
2567345
25'6 7 3 4 5
2567345
7525388
3 2 7 8 9 54
327 8 9 54
526 68 43
32 7 8 9 54
36 7552
3 6 7 5 5 2
100 335 66
3 6 75 52
10 milli
7 8 9 9471
7 8 9 9 471
862275 35
789 9471
52743641
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0
Answer:
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