Question

The mean of the following data is 50 find missing frequencies.
70
90
Total
30
50
10
X
32
19
f
17
f
120​

Answer 1

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Answer 2

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f1 + f2= 120-(17+32+19)

f1+f2= 120-68

f1-52-f2--------(1)

mean-sigma xi fi/ sigma fi

50=3480+30F1+70F2/120

50=10(348+3F1+7F2)/120

600=348+3F1+7F2

Sub equation 1

600-348-3(52-f2)+7f2

252-156-3f2+7f2

96-4f2

f2=24

therefore,

f1-52-24-28

• I Hope it's Helpful My Friend.