Question

With symbols having their usual meanings the mean of the data given below is 39.2.
X
36
40
44
35
f
10
13
12
What is the missing frequency?​

Answer 1

Answer:

hcx gosh cfngganswre is 10

Answer 2

Solution :-

xi fi fi * xi

36 f 36f

40 10 400

44 13 572

35 12 420

⅀fi = (35 + f) ⅀fixi = (1392 + 36f)

we know that,

• Mean = (⅀fixi / ⅀fi)

Now, we have :-

• ⅀fi = (35 + f)
• ⅀fixi = (1392 + 36f)
• Mean = 39.2

Putting all values we get,

→ (1392 + 36f) / (35 + f) = 39.2

→ 1392 + 36f = 39.2(35 + f)

→ 1392 + 36f = 1372 + 39.2f

→ 39.2f - 36f = 1392 - 1372

→ 3.2f = 20

→ f = 6.25 (Ans.)

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