Question

4. In the frequency distribution of families
given below, the number of families
corresponding to expenditure groups 2000-
4000 is missing from the table. However
value of 25th percentile is 2880. Find the
missing frequency
0-2
2-4
4-6
6-8
8-10
Weekly
Expenditure
(1000)
14
2
39
7
15
No. of
families​

Answer 1

Answer:

which chapter is this which book , which STD

Answer 2

N=75+x

P25=2880

P25 lies in class 2000-4000

P25=25*75+x/100

P25=75+x/4

M=L+(N/2-cf/f)*h

2880=2000+(75+x/4-14/x)*2000

2880=2000+(75+x-56/4x)*2000

After solving the bracket we get...

2880=2000+(19+x/x)*500

2880-2000=(19+x/x)*500

880x=(19+x/x)*500

880x=9500+500x

880x-500x=9500

380x=9500

x=9500/380

x=25.