Question

The daily expenses of 40 families has been shown by the following
frequency distribution:
900–1100 1100-1300 1300-1500
7
9
10
Expenses
500-700 700-900
(in)
Number of
6
8
families
Find the mean daily expenses.
[CBSE 2015]​

Answer 1

Answer:

xi = 600, 800, 1000, 1200, 1400

assumed mean (a) = 1000

di = -400, -200, 0, 200, 400

h = 200

ui = -2, -1, 0, 1, 2

fiui = -12, -8, 0, 9, 14

£fiui = 3

£fi = 40

mean = a + (£fiui/£fi)×h

1000+ ( 3/40)×200

= 1000+15

1015

hope it helps

tq./

Step-by-step explanation:

Answer 2

Answer:

this is your answer

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