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Draw a cumulative frequency curve (ogive) and find the median number of eggs laid by chickens based on the provided frequency distribution.
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Answer
Step-by-step solution
3 stepsTo solve this problem, we first need to prepare a cumulative frequency table.
Step 1: Prepare the Cumulative Frequency Table
We need to determine the class boundaries and then calculate the cumulative frequencies.
| No. of eggs | Class Boundaries | No. of Chicken () | Cumulative Frequency () |
|---|---|---|---|
| 44.5 | 0 | 0 | |
| 45-49 | 44.5 - 49.5 | 10 | 10 |
| 50-54 | 49.5 - 54.5 | 36 | 10 + 36 = 46 |
| 55-59 | 54.5 - 59.5 | 64 | 46 + 64 = 110 |
| 60-64 | 59.5 - 64.5 | 52 | 110 + 52 = 162 |
| 65-69 | 64.5 - 69.5 | 28 | 162 + 28 = 190 |
| 70-74 | 69.5 - 74.5 | 10 | 190 + 10 = 200 |
The total number of chickens, .
Part a· 1 step
Draw a Cumulative Frequency Curve (Ogive)
Explain how to draw the Ogive
To draw the cumulative frequency curve, plot the cumulative frequency () against the upper class boundaries.
The points to plot are: , , , , , , and .
Connect these points with a smooth curve. The x-axis represents the number of eggs, and the y-axis represents the cumulative frequency.
Part b(i)
The median
Use your graph to find
Since I cannot draw a graph, I will calculate the values using interpolation formulas, which yield the same results as reading from a precisely drawn ogive.
Calculate the Median
The median is the value at the -th position.
Median position .
From the cumulative frequency table, the 100th value falls in the 55-59 class (cumulative frequency 110).
Median class: 55-59 (boundaries 54.5 - 59.5).
Lower boundary of median class () = 54.5
Frequency of median class () = 64
Cumulative frequency of class before median class () = 46
Class width () = 59.5 - 54.5 = 5
Part b(ii)· 1 step
The interquartile range
Calculate the First Quartile ()
The first quartile is the value at the -th position
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