Question

if the mean of the following frequency distribution is 20 find value of ' t ' with the graph​

Answer 1

Answer:

search-icon-header

Search for questions & chapters

search-icon-image

Class 11

>>Economics

>>Measures of Central Tendency

>>Arithmetic Mean in Statistics

>>If the mean of following frequency distr

Question

Bookmark

If the mean of following frequency distribution is 188 find the missing frequencies f

1

andf

2

C.I. 0-80 80-160 160-240 240-320 320-400 Total

Freq. 20 25 f

1

f

2

10 100

Medium

Solution

verified

Verified by Toppr

Correct option is C)

Given : Mean = 188

C.L. f

i

x

i

f

i

x

i

0 - 80 20 40 800

80 - 160 25 120 3000

160 - 240 f

1

200 200 f

1

240 - 320 f

2

280 280 f

2

320 - 400 10 360 3600

Total ∑f

i

=100=55+f

1

+f

2

∑x

i

f

i

=7400+200f

1

+2800f

2

x

=

∑f

i

∑f

i

x

i

⇒188=

100

7400+200f

1

+280f

2

18800=7400+200f

1

+280f

2

⇒18800−7400=200f