Answer: -
Process average is calculated by average of all sample values average
Sample 1 = (14+9+4+8+3+15+8+6)/8 = 8.375
Sample 2 = (7+25+8+10+10+14+16+15)/8 = 13.125
Sample 3 = (8+11+13+11+8+12+9+22)/8 = 11.75
Sample 4 = (12+7+12+4+11+8+12+8)/8 = 9.25
Sample 5 = (8+12+6+9+14+5+12+8)/8 = 9.25
Process average = average of all sample values
= (8.375+13.125+11.75+9.25+9.25)/5 = 51.75/5 = 10.35
Process average = 10.35
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