Question

Q2.
Find the mean, using direct method:
Class
0-100
100-200 200-300 300-400 400-500
Frequency
6
9
15
12
8

Answer 1

Answer:

Class Interval Frequency f i

Mid-Value x i

f i

x i

0−100 6 50 300

100−200 9 150 1350

200−300 15 250 3750

300−400 12 350 4200

400−500 8 450 3600

∑fi=50 f i

∑ x i=13200

Mean = ∑fixi /∑ fi

= 40/13200

=264