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Natasha_Volkova [10]
3 years ago
10

Find the population variance of: 4 6 8 9 9 round to the nearest hundredth

Mathematics
1 answer:
soldi70 [24.7K]3 years ago
5 0

Answer:

Step-by-step explanation:

To find the population variance, we first need the mean:

\bar{x}=\frac{4+6+8+9+9}{5}=\frac{36}{5}=7.2 so the mean is 7.2. To find the population variance (which is almost exactly the same as the sample variance except for a small difference in the denominators of the formula) we have to take each number minus the mean, and then square the difference. Add together all these squared numbers and then divide by the number of numbers. Like this:

(4-7.2)^2=10.24\\(6-7.2)^2=1.44\\(8-7.2)^2=.64\\(9-7.2)^2=3.24\\(9-7.2)^2=3.24

Add together those numbers and divide them by 5:

\sigma=\frac{10.24+1.44+.64+3.24+3.24}{5}=\frac{18.8}{5}=3.76

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3 years ago
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lutik1710 [3]
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3 0
1 year ago
A large community college has professors and lecturers the total number of faculty members is 136.The school reported that they
Alona [7]

Answer:

  48

Step-by-step explanation:

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Then the ratio of professors to total faculty is ...

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3 years ago
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