Question 712391
To achieve a mean score of 11 then Arun's total score over the first 32 innings must be 11*32 = 352 runs
Similarly Arun's total score over 40 innings must be 40*10 = 400 runs
the difference between these two total scores gives the number of runs he scored in his last 8 innings
400 - 352 = 48 runs
now to find the mean we divide the runs by the number of innings
{{{48/8}}} = 6 
so Arun scored an average (mean) of 6 runs in his last 8 innings