The mean score of 25 observations is 80 and the mean score of another 55 observations is 65. Determine the mean score of the whole set of observations.
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Answered by
10
Answer:
total score of 25 observation = 25×80= 2000
total score of 55 observation= 55×65= 3575
total observation= 25+55= 80
total score= 2000+3575= 5575
average= 5575/80= 69.69
Answered by
4
Answer:
1st observation = 25*80 = 2000.
2nd observation = 55*65 =3575
total score= 2000+ 3575=5575
total observation =25+55=80
5575/80=69.68
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