TAILIEUCHUNG - Wiley publishing inc GMT for dummies Episode 2 part 2

Tham khảo tài liệu 'wiley publishing inc gmt for dummies episode 2 part 2', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 208 Part IV Conquering the Quantitative Section Managing modes You may also encounter mode on the GMAT. The mode is the value that occurs most often in a set of values. Questions about mode may contain words like frequency or ask you how often a value occurs. For example you may be asked what income occurs most frequently in a given population or sample. If more people in the population or sample have an income of 30 000 than any other income amount the mode is 30 000. Whizzing through weighted means The GMAT may test you on weighted means. You determine a weighted mean by multiplying each individual value by the number of times it occurs in a set of numbers. Then you add these products together and divide this sum by the total number of times all the values occur. For example suppose you re given Table 14-1 charting Becky s grades in all her classes and the amount of credits for each. Table 14-1 The Weighted Mean of Grade Point Averages Class Number of Credits Grade Total Grade Points Statistics 5 19 English 5 Speech 4 Bowling 1 4 Total 15 GPA First you multiply the individual values the grades by the number of times they each occur the credits to get total grade points for each class. Then you add up the total grade points for all classes and divide by the total number of times they all occur which is the number of total credits 15 15 GPA. Straying from Home Range and Standard Deviation Besides knowing the main concepts of central tendency you should also know about variation or dispersion of values in statistics. The mean median and mode can tell you something about the central tendency of a set of values but the dispersion tells you how spread out the values are from the center. If dispersion is small the values are clustered around the mean. But a wide dispersion of values tells you that the mean average isn t a reliable representative of all the values. Scouting out the range The easiest measure of dispersion .

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