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Answer:

CLASS interval Mid value (x

i

) (f

i

) u

i

=

3

x

i

−75.5

f

i

u

i

65−68 66.5 2 −3 −6

68−71 69.5 4 −2 −8

71−74 72.5 3 −1 −3

74−77 75.5 8 0 0

77−80 78.5 7 1 7

80−83 81.5 4 2 8

83−86 84.5 2 3 6

Total 30 4

Lets TAKE assumed mean, A as 75.5

Class interval =3

∴u

i

=

h

x

i

−A

=

3

x

i

−75.5

x

ˉ

=A+h

∑f

i

∑f

i

u

i

=75.5+3×

30

4

=75.5+0.4=75.9

Hence, the mean HEART beats per minute for these women is 75.9


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