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Question id: 4. This question is similar to one that appeared in an IB Standard paper in 2010. The use of a calculator is allowed.
The personal trainer collected data from a randomly selected sample of days. From this he found that the number glasses of water he drank in a day had a mean of 4.35.
(a) Find the number of days represented by \(x\)
(b) Write down the standard deviation.
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