Question 339191
Hint: Add in some unknown number 'x' to get 11, 9, 18, 24, 8, 14, x



Now compute the mean to get {{{(11+9+18+24+8+14+x)/7}}}. Since you want the mean to be 15, this means that {{{(11+9+18+24+8+14+x)/7=15}}}



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Jim