-18, 10, -20, -11, 9, 18MeanMedianModeRange

Mean = -2Median = -1Mode = NilRange = 38Step-by-step explanation:Given data is:-18, 10, -20, -11, 9, 18Arranging the data in ascending order-20, -18, -11, 9, 10, 18Mean:Mean is given by the formula[tex]Mean=\frac{Sum}{items}[/tex]Items are: 6[tex]Mean = \frac{-20-18-11+9+10+18}{6}\\= \frac{-12}{2}\\= -2[/tex]Mode:Mode is the most frequent value in the data. So,As there is no value repeated in the data. There is no modeMedian:Median is the middle value of the data. As the no. of data value are even,the average of middle 2 values is mode.Note that the data has to be arranged in ordered to find medianHere,[tex]Median = \frac{-11+9}{2}\\=\frac{-2}{2}\\= -1[/tex]Range:Range is the difference between the largest and smallest value of the dataHereLargest value = 18Smallest value = -20So,[tex]Range = Largest\ value-Smallest value\\= 18-(-20)\\= 18+20\\=38[/tex]Hence,Mean = -2Median = -1Mode = NilRange = 38Keywords: Data, MedianLearn more about statistics at:brainly.com/question/4279146brainly.com/question/4354581#LearnwithBrainly