Question

Find the quartile deviation of the following given C.I. f 50-54 1 45-49 1 40-44 2 35-39 4 30-34 6 25-29 10 20-24 5 15-19 5 10-14 3 5-9 3 N = 40​

Answer 1

Answer:

class interval Mid-point

x

i

Frequency

f

i

f

i

x

i

25-29 27 14 378

30-34 32 22 704

35-39 37 16 592

40-44 42 6 252

45-49 47 5 235

50-54 52 3 156

55-59 57 4 228

Σf

i

=70 Σf

i

x

i

=2545

Mean=

Σf

i

Σf

i

x

i

=

70

2545

=36.36

Explanation:

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