Question 1053991
Find the weighted average, 
{{{mu=(3*0+ 4*2+ 5*2+ 6*1+ 7*2+ 8*3+ 9*0+ 10*4)/(0+2+2+1+2+3+0+4)= 51/7}}}
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There are 14 values, average the score for the 7th and 8th score.
{{{M=(7+8)/2=15/2}}}