The mean and standard deviation of the weights of 20 school children are recorded to be 30 kg. and 3 kg. respectively. If each of the children is asked to hold a school bag weighing one kg and weights are measured again, then the new mean and standard deviation of weights of children respectively are:
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Descriptive statistics and dispersion has come up 117 times in 6 exams since 2004.
This question is on Measures of dispersion, part of Descriptive statistics and dispersion in Statistics.
How spread out data are: range, variance, standard deviation and relative measures.
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Question from the UoH 2011 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.