Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Median for grouped data |
Grade: 9-a Lesson: S1-L5 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
From the given observations. Find the median |
|
2 |
Step |
From the above table |
\$n=40\$ |
3 |
Step |
Finding median class |
\$n/2 = 40/2 = 20\$ |
4 |
Step |
Median class |
61-90 |
5 |
Step |
Lower class limit l |
\$l = 61\$ |
6 |
Step |
Cumulative frequency of the preceding class of the median class cf |
\$cf = 7\$ |
7 |
Step |
Frequency of the median class f |
\$f = 15\$ |
8 |
Step |
class size h |
\$h = 90-61 = 29\$ |
9 |
Formula: |
Median = \$l + (n/2 -cf)/f × h\$ |
|
10 |
Step |
Substitute all the above values and solve |
Median = \$61 + (40/2 - 7)/15 × 29\$ |
11 |
Step |
Simplification |
\$61 + (20-7)/15 × 29\$ |
12 |
Step |
Simplification |
\$61 + 13/15 × 29\$ |
13 |
Step |
Simplification |
\$61 + 0.86 × 29\$ |
14 |
Step |
After simplification |
\$61 + 25.13\$ |
15 |
Step |
After addition |
\$86.13\$ |
16 |
Answer |
A = 86.13 |
|
Tutor: Questions
| Seq | Type | Question | Audio |
|---|---|---|---|
1 |
Problem |
What did you learn from this problem? |
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2 |
Clue |
What did you learn from the clues? |
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3 |
Hint |
What did you learn from the Hints? |
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4 |
Step |
What did you learn from the Steps? |
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5 |
Step |
How can we improve the Steps? |
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