Question

the main of 10 number is 55 if one number is excluded there mean becomes 50 the excluded number is​

Answer 1

average(mean)=sum of data/ number of data

sum of data= average x (number of data-1)              y is -1 bcoz one data is excluded

Given, mean=55, No of data= 10

Now, 55x10=50(10-1) +a         a is excluded data

550=450 + a

a=100