Question

Give me the solution of question​

Answer 1

Answer:

here is ur answer

Step-by-step explanation:

mean(x) = £fixi/£fi

mean= 50

total of fi = 120

finding xi

1. 20/2= 10
2. 60/2= 30
3. 100/2= 50
4. 140/2= 70
5. 180/2= 90

now , finding fixi

1. 10×17=170
2. 30× f1= 30f1
3. 50×32=1600
4. 70×f2= 70f2
5. 90×19=1710

so sum of fixi= 3480+30f1+68+f1

mean= £fixi/£fi

50= 3480+ 30f1+70f2/

120

we have, 120= 68+f1+f2

f1+f2= 52. (1)

30f1+70f2=6000-3460=2520

3f1+7f2= 252. .(2)

eliminating the equation

eq(1)=> 7f1+7f2=7×52= 364

(2)=> 3f1+7f2=252

= 4f1= 112

= f1=28 (from1)

= f2=52-f1

= 52-28= 24

f2= 24

so f1=28 & f2=24

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