Lesson Example Discussion Quiz: Class Homework |
Step-4 |
Title: Measures of variation- Population Standard deviation |
Grade: 9-a Lesson: S2-L2 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
Following are the salaries of 3 teachers in a school of this month.Find the standard deviation 12,8,10 |
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2 |
Step |
To find the mean \$\mu\$ = \$(12+8+10)/(3)\$ = \$30/3\$ = 10 |
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3 |
Step |
Subtracting each score from mean and square each deviation |
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4 |
Step |
Add the squared deviation \${X_i - \mu}^2\$ |
4+4+0 = 8 |
5 |
Step |
Divide the sum by number of scores to get the variance |
\$frac\{8}{3}\$ = 2.66 |
6 |
Step |
Take the square root of the squared deviation (or) variance |
\$\sqrt(2.66)\$ = 1.63 \$\approx\$ 1.6 |
7 |
Step |
Population standard deviation |
\$\sigma\$ = 1.6 |
8 |
Answer |
B |
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Tutor: Questions
| Seq | Type | Question | Audio |
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1 |
Problem |
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2 |
Clue |
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3 |
Hint |
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4 |
Step |
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5 |
Step |
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