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This is true in this question, because you know the distribution is symmetric. When a distribution is symmetric, the median and the mean are equal. However, in many sets you'll encounter on the GMAT, the median and the mean will be different.parallel_chase wrote:In such questions always remember mean is the mid point which means 50% values is greater than the mean and 50% are below the mean
This rule only applies to data that is 'normally distributed', something which you can never assume to be the case on the GMAT (and you don't need to know what 'normally distributed' means, either). The 68-95-99.7 rule is not true for arbitrary distributions of data, nor is it tested on the GMAT. You don't need to know anything about normal distributions to solve the above problem, and you don't need the 68-95-99.7 rule; you only need to know what is meant by 'symmetric distribution'.parallel_chase wrote:
Always remember the 68-95-99.8 rule of statistics
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