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zairaefh3200
07.07.2019 •
Mathematics
Suppose the population of a certain city is 4735 thousand. it is expected to decrease to 4049 thousand in 50 years. find the percent decrease
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Ответ:
Ответ:
12.20.
Step-by-step explanation:
Variance = ∑( x - m)^2 / n where m = mean and n = number of readings.
m = 84/12 = 7.
x - m for the first value is 10.4 - 7 = 3.4.
Create a table:
x - m (x - m)^2
3.4 11.56
3.3 10.89
4.7 22.09
4.1 16.81
1 1
-2.6 6.76
-4.4 19.36
-5.2 27.04
-4.5 20.25
-2.6 6.76
0.3 0.09
2.5 6.25
Total:
∑(x -m) ^2 = 148.86
So the variance = 148.86 / 12
= 12.20 (answer).