Question

The mean of the following frequency distribution is 43.75. Find the missing frequency
Class. frequency
0-10 8
10-20. 4
20-30 20
30 - 40. 45
40-50 64
50-60 32
60 - 70 f
70 - 80 8
80 - 90 2
90 - 100. 2​

Answer 1

Answer:

......................:)

Step-by-step explanation:

Answer 2

Solution :-

Class Fi Xi FiXi

0-10 8 5 40

10-20 4 15 60

20-30 20 25 500

30-40 45 35 1575

40-50 64 45 2880

50-60 32 55 1760

60-70 f 65 65f

70-80 8 75 600

80-90 2 85 170

90-100 2 95 190

⅀Fi=185+f ⅀FiXi=7775+65f

we know that,

• Mean = ⅀FiXi / ⅀Fi

so,

→ (7775 + 65f) /(185 + f) = 43.75

→ 7775 + 65f = 8093.75 + 43.75f

→ 65f - 43.75f = 8093.75 - 7775

→ 21.25f = 318.75

→ f = (318.75/21.25)

→ f = 15 .(Ans.)

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