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Sagot :
mean = 13.67
Step-by-step explanation:
observations = 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14
mean = sum of observations ÷ numbers of observations
...........................................
sum of observation = 4+21+13+17+5+9+10+20+19+12+20+14
= 164
numbers of observation = 12
mean = 164 ÷ 12
= 13.67
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