the mean of 10 numbers is 55. if one number is excluded their mean become 50 .the excluded number is
the mean of 10 numbers is 55. if one number is excluded their mean become 50 .the excluded number is
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here is your answer !!!
the mean of 10 number is = 55
mean = sum of observation / total number of observation
=> 55 = sum of 10 numbers / 10
sum of 10 number = 550
now ,
let the exclude number be " X "
mean = sum of 10 number - x / 9
50 × 9 = 550 - X
=> 450 = 550 - X
=> x =100
hence , the number excluded is 100
★Ans :- 100 ★
hope it helps you dear !!