If the mode of the given is 22.75, find the cumulative frequency
If the mode of the given is 22.75, find the cumulative frequency (x<9).
यदि दिए गए आँकड़ों का बहुलक 22.75 है, तो संचयी बारंबारता (x < 9) ज्ञात कीजिए।
| Class Interval वर्ग – अंतराल |
0-7 | 7 – 14 | 14 – 21 | 21 – 28 | 28 – 35 | 35 – 42 |
| Frequency बारंबारता |
1 | 7 | 9 | 11 | X | 3 |
Detailed Solution & Logic
36
दिया गया है:
Mode (बहुलक) = $22.75$
Step 1: $X$ ज्ञात करना
बहुलक वर्ग (Modal Class) = $21$–$28$
Mode का सूत्र (Grouped Data):
$ \text{Mode} = l + \dfrac{(f_1 - f_0)}{(2f_1 - f_0 - f_2)} \times h $
जहाँ
$l = 21$
$h = 7$
$f_1 = 11$
$f_0 = 9$
$f_2 = X$
मान रखने पर,
$22.75 = 21 + \dfrac{(11 - 9)}{(2\times11 - 9 - X)} \times 7$
$22.75 - 21 = \dfrac{14}{13 - X}$
$1.75 = \dfrac{14}{13 - X}$
$13 - X = 8$
$\Rightarrow X = 5$
Cumulative (Total) Frequency:
$= 1 + 7 + 9 + 11 + 5 + 3$
$= \boxed{36}$
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