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GMAT数学考试常见题型的解题技巧有哪些呢?以下将为大家深入分析GMAT数学考试常见题型的解题策略和技巧，希望能够为考生备战GMAT数学考试带来帮助。 106. 11122-!-item-!-187;#058007588 If a certain sample of data has a mean of 20.0 and a standard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean? 12.0 13.5 17.0 23.5 26.5 【答案】 A 几倍的标准差，就用平均值加减几倍的标准差，即为新的值域 110. 11364-!-item-!-187;#058007646 The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching television. The distribution of the results of the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean. Which of the following could be the number of hours that Pat watched television last week? 30 20 18 12 6 -------------------------------------------------------------------------------------------------------------------------------- | 
