Question

Class frequency
0-20 17
20-40 F1
40-60 32 60-80 F2
80-100 19
Total 120 The mean of the following distribution is 50 find the missing frequency F1 and F2

Answer 1

Answer:

F1 = 24 & F2 = 28

Step-by-step explanation:

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Answer 2

Answer:

Solution:

We have,

Mid point Frequency

(x) (f) fx

10 17 170

30 f1 30f1

50 32 1600

70 f2 70f2

90 19 1710

total 120 30f1+70f2+3480

Now, x¯=1120Σfx

⇒50=1120×(30f1+70f2+3480)

⇒600=3f1+7f2+348

⇒3f1+7f2=252…(i)

Also, f1+f2+68=120

⇒f1+f2=52…(ii)

Solving (i) and (ii), we get f1=28, f2=24