Question

draw a frequency polygon for the given datacost of living index 140 -150 150-160 160-170 -170-180 180-190 190-200 number of 5 10 20 9 6 2​

Answer 1

Answer:

plize klick on brainlests plize

Step-by-step explanation:

Let a = 175, h = 20

Calculation of Mean

Class

interval No.of

weeks (f

i

) mid-point

(x

i

)

u

i

=

10

x

i

−175

a f

i

u

i

140 - 150 5 145 -3 -15

150 - 160 10 155 -2 -20

160 - 170 20 165 -1 -20

170 - 180 9 175 0 0

180 - 190 9 175 1 6

180 - 190 6 185 1 6

190 - 200 2 195 2 4

Total 52 -45

u

ˉ

=

n

1

i=l

∑

6

f

i

u

i

=−

52

45

∴

x

ˉ

=a+h

u

~

=175+10(−

52

45

)

=175−

52

450

=175−8.65=166.35

Hence mean weekly cost of living index

= 166.35

= 166.3 (approx)