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Lunna [17]
3 years ago
10

In a test, the 10 students in group 1 get a mean score of 43%.

Mathematics
1 answer:
blagie [28]3 years ago
7 0
The mistake is that he forgot that the groups were not equal! one group was bigger than another, but he treated them as if they were equal

the real mean is calculated like this:

(43*10+15*57)/25=

(1285)/25=51.4


the real mean was 51.4



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