'Mean', 'mode', 'median' and 'standard deviation' are all quantities used in statistics. Each one is an attempt to use a single number to describe the essential nature and character of a bunch of numbers.
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characteristics of mean
To obtain a much better, simpler, and more practical understanding of the data distribution.
Everyone is average, whether that average is the mean, median, or mode.
The statement is probably: The mean and standard deviation of a distribution are 55 and 4.33 respectively.
The answer will depend on what you mean by "solve". Find the mean, median, mode, variance, standard error, standard deviation, quartiles, deciles, percentiles, cumulative distribution, goodness of fit to some distribution etc. The question needs to be a bit more specific than "solve".