Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Measures of variation- Sample Standard deviation |
Grade: 9-a Lesson: S2-L3 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
Allen brought 10 dolls and 5 were selected.Find the standard deviation on the price of dolls $2.5,$5.3,$1.2,$0.6,$0.8 |
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2 |
Step |
To find the mean \$\barX\$ = \$(2.5+5.3+1.2+0.6+0.8)/(5)\$ = \$10.4/5\$ = 2.08 |
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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 - \barX}^2\$ |
0.17+10.36+0.77+2.19+1.63 = 15.12 |
5 |
Step |
Divide the sum by number of scores to get the variance |
\$frac\{15.12}{5-1}\$ = \$frac\{15.12}{4}\$ = 3.78 |
6 |
Step |
Take the square root of the squared deviation (or) variance |
\$\sqrt(3.78)\$ \$\approx\$ 1.94 |
7 |
Step |
Sample standard deviation |
\$s\$ = 1.94 |
8 |
Answer |
B |
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Tutor: Questions
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Problem |
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2 |
Clue |
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3 |
Hint |
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4 |
Step |
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Step |
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