Question

With symbols having their usual meanings the mean of the data given below is 39.2.
36
40
35
44
13
12
10
f
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What is the missing frequency?
O 123.8
5214
O 124.6
O 125.2​

Answer 1

Step-by-step explanation:

11th

Maths

Statistics

Revision of Mean and Median

If mean of the following da...

STATISTICS

If mean of the following data is 44, find the missing frequency (x).

Class 0−20 20−40 40−60 60−80 80−100

Frequency 12 x 6 7 9

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ANSWER

class x f fx

0 - 20 10 12 120

20 - 40 30 x 30x

40 - 60 50 6 300

60 - 80 70 7 490

80 - 100 90 9 210

Sum 34+x 1720+30x

x

ˉ

=

∑f

∑fx

34+x

1720+30x

=44

1720+30x=44(34+x)

1720+30x=1496+44x

224=14x

x=16