answer fast class 10
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Answer:
F1=8
- F2=12
Step-by-step explanation:
Class
Frequency(f)
ClassMark (x)
fx
0-20
5
10
50
20-40
f
1
30
30f
1
40-60
10
50
500
60-80
f
2
70
70f
2
80-100
7
90
630
100-120
8
110
880
Total
30+f
1
+f
2
2060+30f
1
+70f
2
Given 30+f
1
+f
2
=50
=>f
1
+f
2
=20 -- (1)
Given, Mean =
∑f
∑fx
=62.8
=>
30+f
1
+f
2
2060+30f
1
+70f
2
=62.8
=>2060+30f
1
+70f
2
=1884+62.8f
1
+62.8f
2
32.8f
1
−7.2f
2
=176
=> 8.2f
1
−1.8f
2
=44
=> 4.1f
1
−0.9f
2
=22 -- (2)
Solving both equations 1, 2, we get
f 1 =8, f2=12
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