10 The masses of a random sample of 120 boulders in a certain area were recorded. The results are summarized in the histogram.
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- Calculate the number of boulders with masses between 60 and 65 kg .
- Use midpoints to find estimates of the mean and standard deviation of the masses of the boulders in the sample.
- Explain why your answers are only estimates.
- Use your answers to part (b)(i) to determine an estimate of the number of outliers, if any, in the distribution.
- Give one advantage of using a histogram rather than a pie chart in this context.