Question

How to calculate percentile of group of lo students
scoring
15.5, 16:0,17.5,18.0,18.0,18.0,19.5, 20.0,20.0 4 20.0 morksh
out of zomarks!​

Answer 1

Answer:

Step-by-step explanation:

Calculation of Q1 ,Q3 , D2 ,P90 and P5

Lower quartile or Q1= size of (N/4)th item =Size of (80/4) th = 20th item

Q1 lies in the class 20-40

Q1 =L+{(N/4- CF)/F}*I

where :

L= lower limit of the class interval in which lower quartile lies , F= frequency of the

interval in which lower quartile lies , CF= cumulative frequency of the class preceding

the quartile class