Question

find the number of observations between 250 and 300 from the following data;

Value: more than 200, more than 250, more than 300, more than 350.
No.of observations: 56, 38, 15, 0.

its urgent
pls

Answer 1

Answer:

Score No.ofstudents Score cf

200−250 30 More than 200 200

250−300 15 More than 250 170

300−350 45 More than 300 155

350−400 20 More than 350 110

400−450 25 More than 400 90

450−500 40 More than 450 65

500−550 10 More than 500 25

550−600 15 More than 550 15

⇒ The coordinates for curves are (200,200),(250,170),(300,155),(350,110),(400,90),(450,65),(500,25),(550,15)

⇒ Here, N=200. So,

2

N

=100

Draw LM⊥OX

We get M=375

∴ Median=375